diff --git a/src/fighter/animation.rs b/src/fighter/animation.rs
index 71ba4d7..6e63bd0 100644
--- a/src/fighter/animation.rs
+++ b/src/fighter/animation.rs
@@ -1,4 +1,5 @@
 use bevy::prelude::*;
+use strum_macros::EnumIter;
 
 use crate::fighter::{FighterFacingDirection, FighterVisual};
 
@@ -63,7 +64,7 @@ pub fn apply_animation(
 }
 
 #[derive(
-    Debug, Clone, Copy, PartialEq, Eq, Hash, serde::Deserialize, serde::Serialize, Reflect,
+    Debug, Clone, Copy, PartialEq, Eq, Hash, serde::Deserialize, serde::Serialize, Reflect, EnumIter
 )]
 pub enum AnimKind {
     Wait,
diff --git a/src/fighter/attack.rs b/src/fighter/attack.rs
index 4a5b70a..3eba7ac 100644
--- a/src/fighter/attack.rs
+++ b/src/fighter/attack.rs
@@ -175,7 +175,7 @@ pub fn update_active_hitbox_list(script: &FighterAttackScript, list: &mut Vec<us
         .collect()
 }
 
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Hash)]
 pub struct FighterSolvedHurtbox {
     pub hurtbox_idx: usize,
     pub capsule: FixedAffineCapsule,
@@ -185,7 +185,7 @@ pub struct FighterSolvedHurtbox {
 pub struct FighterAttackScriptAssets {
     pub scripts: HashMap<AttackKind, Handle<FighterAttackScript>>,
 }
-#[derive(Component, Clone, Debug, Default)]
+#[derive(Component, Clone, Debug, Default, Hash)]
 pub struct FighterSolvedHurtboxes(pub Vec<FighterSolvedHurtbox>);
 
 pub fn solve_hurtboxes(
diff --git a/src/fighter/baked_animation.rs b/src/fighter/baked_animation.rs
index 9e3d29b..1973b17 100644
--- a/src/fighter/baked_animation.rs
+++ b/src/fighter/baked_animation.rs
@@ -38,7 +38,7 @@ pub const BAKED_ANIMATION_FPS: u32 = 60;
 
 /// Parent transforms are composed after
 /// quantization, which makes every runtime sample platform-independent.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize, Hash)]
 pub struct FixedMat4 {
     pub cols: [[FGi32; 4]; 4],
 }
diff --git a/src/fighter/collision.rs b/src/fighter/collision.rs
index eff1bd4..d485a80 100644
--- a/src/fighter/collision.rs
+++ b/src/fighter/collision.rs
@@ -30,7 +30,7 @@ pub fn collide_fighter_with_scene(
     }
 }
 */
-
+#[derive(Clone)]
 pub struct AirCollisionWithStageResult {
     pub line_id: StageLineID,
     pub hit_position: FGVec2,
@@ -45,9 +45,11 @@ pub fn air_collide_with_stage(
         state_context.translation.0 + state_context.ecb.get_bottom_point(),
     );
 
+    let mut intersect_results = vec![];
+
     for (poly_idx, poly) in state_context.stage_collision.stage_polys.iter().enumerate() {
         if let Some(intersect_result) = poly.intersect_ray(ray_segment) {
-            return Some(AirCollisionWithStageResult {
+            intersect_results.push((AirCollisionWithStageResult {
                 line_id: {
                     StageLineID {
                         polygon: poly_idx,
@@ -56,9 +58,14 @@ pub fn air_collide_with_stage(
                 },
                 hit_position: intersect_result.position,
                 hit_normal: intersect_result.normal,
-            });
+            }, intersect_result.position.distance_squared(ray_segment.point2())));
         }
     }
+    intersect_results.sort_by(| (_, a), (_, b) | {
+        a.cmp(b)
+    });
 
-    None
+    intersect_results.iter().last().map(|(val, _)| {
+        val.to_owned().clone()
+    })
 }
diff --git a/src/fighter/ecb.rs b/src/fighter/ecb.rs
index b05527b..c8bae0e 100644
--- a/src/fighter/ecb.rs
+++ b/src/fighter/ecb.rs
@@ -5,14 +5,14 @@ use crate::math::{int::FGi32, vec::FGVec2};
 /// Environment collision box: the diamond used to resolve a fighter against
 /// the stage. Purely geometry — the collision response lives in
 /// [`super::collision`].
-#[derive(Component, Debug, Clone, Copy)]
+#[derive(Component, Debug, Clone, Copy, Hash)]
 #[require(FighterPreviousECB)]
 pub struct FighterECB {
     pub vertical_half: FGi32,
     pub horizontal_half: FGi32,
 }
 
-#[derive(Component, Debug, Clone, Copy, Default)]
+#[derive(Component, Debug, Clone, Copy, Default, Hash)]
 pub struct FighterPreviousECB {
     pub vertical_half: FGi32,
     pub horizontal_half: FGi32,
diff --git a/src/fighter/hurtbox.rs b/src/fighter/hurtbox.rs
index 9024787..45f69b7 100644
--- a/src/fighter/hurtbox.rs
+++ b/src/fighter/hurtbox.rs
@@ -10,7 +10,7 @@ use crate::{
 
 /// A capsule after an arbitrary affine transform. Non-uniform scale turns the
 /// spherical caps and circular cylinder into ellipsoidal geometry.
-#[derive(Clone, Copy, Debug, PartialEq)]
+#[derive(Clone, Copy, Debug, PartialEq, Hash)]
 pub struct FixedAffineCapsule {
     pub transform: FixedMat4,
     pub half_length: FGi32,
diff --git a/src/fighter/manifest.rs b/src/fighter/manifest.rs
index 9b368f6..d2224c7 100644
--- a/src/fighter/manifest.rs
+++ b/src/fighter/manifest.rs
@@ -109,13 +109,17 @@ pub fn prepare_fighter_manifests(
             );
             return;
         }
-        if !manifest.animations.contains_key(&AnimKind::Wait) {
-            fail(
-                &mut next_state,
-                &format!("{:?} has no Wait animation", manifest.id),
-            );
-            return;
+
+        for anim_kind in AnimKind::iter() {
+            if !manifest.animations.contains_key(&anim_kind) {
+                fail(
+                    &mut next_state,
+                    &format!("{:?} has no {:?} animation", manifest.id, anim_kind),
+                );
+                return;
+            }
         }
+
         if !manifest.camera.is_valid() {
             fail(
                 &mut next_state,
diff --git a/src/fighter/mod.rs b/src/fighter/mod.rs
index 06fef19..9c1b7ce 100644
--- a/src/fighter/mod.rs
+++ b/src/fighter/mod.rs
@@ -144,13 +144,19 @@ impl Plugin for FighterPlugin {
             // components; a component simulated here but missing from this list
             // is a desync waiting to happen.
             .rollback_component_with_copy::<FighterECB>()
+            .checksum_component_with_hash::<FighterECB>()
             .rollback_component_with_copy::<ecb::FighterPreviousECB>()
+            .checksum_component_with_hash::<ecb::FighterPreviousECB>()
             .rollback_component_with_copy::<FighterVelocity>()
+            .checksum_component_with_hash::<FighterVelocity>()
             .rollback_component_with_copy::<FighterTranslation>()
+            .checksum_component_with_hash::<FighterTranslation>()
             .rollback_component_with_copy::<FighterPreviousTranslation>()
+            .checksum_component_with_hash::<FighterPreviousTranslation>()
             .rollback_component_with_copy::<animation::FighterAnimationFrame>()
             .checksum_component_with_hash::<animation::FighterAnimationFrame>()
             .rollback_component_with_copy::<Grounded>()
+            .checksum_component_with_hash::<Grounded>()
             .rollback_component_with_copy::<FighterFacingDirection>()
             .rollback_resource_with_reflect::<StageCollision>()
             // Debug views.
@@ -176,14 +182,16 @@ impl Plugin for FighterPlugin {
             )
             .rollback_component_with_clone::<FighterState>()
             .rollback_component_with_clone::<FighterHitboxes>()
+            .checksum_component_with_hash::<FighterHitboxes>()
             .rollback_component_with_clone::<FighterSolvedHurtboxes>()
+            .checksum_component_with_hash::<FighterSolvedHurtboxes>()
             .checksum_component_with_hash::<FighterState>()
             .checksum_component_with_hash::<FighterFacingDirection>()
             .register_type::<FighterFacingDirection>();
     }
 }
 
-#[derive(Component, Clone)]
+#[derive(Component, Clone, Hash)]
 pub struct FighterHitboxes {
     pub attack_script: Option<Handle<FighterAttackScript>>,
     pub active_hitboxes: Vec<usize>,
diff --git a/src/fighter/motion.rs b/src/fighter/motion.rs
index 10b32f2..e01889e 100644
--- a/src/fighter/motion.rs
+++ b/src/fighter/motion.rs
@@ -10,16 +10,16 @@ use crate::{
     math::{int::FGi32, vec::FGVec2, vec3::FGVec3},
 };
 
-#[derive(Component, Clone, Copy)]
+#[derive(Component, Clone, Copy, Hash)]
 pub struct Grounded;
 
-#[derive(Component, Deref, DerefMut, Default, Debug, Clone, Copy)]
+#[derive(Component, Deref, DerefMut, Default, Debug, Clone, Copy, Hash)]
 pub struct FighterVelocity(pub FGVec2);
 
-#[derive(Component, Deref, DerefMut, Default, Clone, Copy)]
+#[derive(Component, Deref, DerefMut, Default, Clone, Copy, Hash)]
 pub struct FighterPreviousTranslation(pub FGVec2);
 
-#[derive(Component, Deref, DerefMut, Default, Clone, Copy)]
+#[derive(Component, Deref, DerefMut, Default, Clone, Copy, Hash)]
 #[require(FighterPreviousTranslation)]
 pub struct FighterTranslation(pub FGVec2);
 
diff --git a/src/fighter/state/jump.rs b/src/fighter/state/jump.rs
index ead92a6..44f7187 100644
--- a/src/fighter/state/jump.rs
+++ b/src/fighter/state/jump.rs
@@ -221,11 +221,6 @@ impl FighterStateImpl for JumpState {
         };
 
         state_context.velocity.y = vertical_vel;
-        state_context.velocity.x += state_context
-            .fighter_manifest
-            .attributes
-            .jump_horizontal_velocity
-            * movement_stick_x;
     }
 
     fn check_collision_interrupt(
diff --git a/src/fighter/state/mod.rs b/src/fighter/state/mod.rs
index 544410b..b17e62a 100644
--- a/src/fighter/state/mod.rs
+++ b/src/fighter/state/mod.rs
@@ -120,7 +120,7 @@ impl FighterStateContext<'_> {
         anims_data
             .frame_count(self.animation_frame.kind)
             .expect("Current animation should have baked frames")
-            < self.animation_frame.frame
+            <= self.animation_frame.frame
     }
 }
 
diff --git a/src/input/buffer.rs b/src/input/buffer.rs
index b964065..0c95838 100644
--- a/src/input/buffer.rs
+++ b/src/input/buffer.rs
@@ -25,7 +25,7 @@ pub enum FighterCommands {
 
 /// Frames of life remaining for each buffered command. Indexed by
 /// [`FighterCommands`] so adding a command is a two-line change here.
-#[derive(Default, Clone, Copy)]
+#[derive(Default, Clone, Copy, Hash)]
 pub struct FighterCommandLifetimes {
     smash_move_left: u8,
     smash_move_right: u8,
@@ -60,7 +60,7 @@ impl IndexMut<FighterCommands> for FighterCommandLifetimes {
     }
 }
 
-#[derive(Component, Default, Clone, Copy)]
+#[derive(Component, Default, Clone, Copy, Hash)]
 #[require(Rollback)]
 pub struct FighterInput {
     command_lifetimes: FighterCommandLifetimes,
diff --git a/src/input/frame.rs b/src/input/frame.rs
index ef926d2..3422f67 100644
--- a/src/input/frame.rs
+++ b/src/input/frame.rs
@@ -4,7 +4,7 @@ use crate::math::vec::FGVec2;
 
 /// One frame of a player's raw input. This is the type GGRS serializes and
 /// sends over the wire, so keep it small and keep it `PartialEq`.
-#[derive(Copy, Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
+#[derive(Copy, Clone, Debug, PartialEq, Default, Serialize, Deserialize, Hash)]
 pub struct FighterInputFrame {
     pub movement: FGVec2,
     pub directional_attack: FGVec2,
diff --git a/src/input/mod.rs b/src/input/mod.rs
index b51f647..d7deb86 100644
--- a/src/input/mod.rs
+++ b/src/input/mod.rs
@@ -108,7 +108,8 @@ impl Plugin for FighterInputPlugin {
             GgrsSchedule,
             buffer::postprocess_input.in_set(GameplaySet::Input),
         )
-        .rollback_component_with_clone::<FighterInput>();
+        .rollback_component_with_clone::<FighterInput>()
+        .checksum_component_with_hash::<FighterInput>();
     }
 }
 
diff --git a/src/math/vec.rs b/src/math/vec.rs
index d33fe14..6186b44 100644
--- a/src/math/vec.rs
+++ b/src/math/vec.rs
@@ -118,6 +118,12 @@ impl FGVec2 {
         (to - self).length()
     }
 
+    #[inline]
+    #[must_use]
+    pub fn distance_squared(self, to: Self) -> FGWide {
+        (to - self).length_squared()
+    }
+
     #[inline]
     pub fn normalize(&self) -> Option<Self> {
         let x = I32F32::from_num(self.x);