diff --git a/asm/non_matching/player/SurfaceAction_Swamp.inc b/asm/non_matching/player/SurfaceAction_Swamp.inc
deleted file mode 100644
index 24b96bf6..00000000
--- a/asm/non_matching/player/SurfaceAction_Swamp.inc
+++ /dev/null
@@ -1,146 +0,0 @@
-    .syntax unified
-	push {r4, lr}
-	adds r4, r0, #0
-	bl sub_080741C4
-	cmp r0, #0
-	beq _08074690
-	ldr r0, _0807468C @ =gPlayerState
-	movs r1, #0
-	strb r1, [r0, #0x11]
-	b _080746CE
-	.align 2, 0
-_0807468C: .4byte gPlayerState
-_08074690:
-	adds r0, r4, #0
-	adds r0, #0x45
-	ldrb r0, [r0]
-	cmp r0, #0
-	beq _0807476C
-	adds r0, r4, #0
-	bl sub_08079C30
-	adds r1, r0, #0
-	cmp r1, #0
-	bne _080746B0
-	ldr r0, _080746AC @ =gPlayerState
-	strb r1, [r0, #0x11]
-	b _080746CE
-	.align 2, 0
-_080746AC: .4byte gPlayerState
-_080746B0:
-	ldr r3, _080746D4 @ =gPlayerState
-	ldr r1, [r3, #0x30]
-	movs r0, #0x80
-	ands r1, r0
-	cmp r1, #0
-	bne _0807476C
-	ldrb r2, [r3, #0x1e]
-	cmp r2, #0
-	beq _080746D8
-	movs r0, #0x40
-	ands r0, r2
-	cmp r0, #0
-	beq _080746DC
-	strb r1, [r3, #0x11]
-	adds r0, r3, #0
-_080746CE:
-	adds r0, #0x37
-	strb r1, [r0]
-	b _08074792
-	.align 2, 0
-_080746D4: .4byte gPlayerState
-_080746D8:
-	bl sub_08077B20
-_080746DC:
-	ldr r1, _08074700 @ =gPlayerState
-	adds r0, r1, #0
-	adds r0, #0x37
-	ldrb r0, [r0]
-	cmp r0, #1
-	bne _08074704
-	adds r0, r4, #0
-	movs r1, #0x70
-	movs r2, #0
-	movs r3, #0
-	bl CreateObjectWithParent
-	adds r0, r4, #0
-	movs r1, #0x52
-	movs r2, #0
-	bl CreateFx
-	b _08074714
-	.align 2, 0
-_08074700: .4byte gPlayerState
-_08074704:
-	adds r0, r1, #0
-	adds r0, #0x92
-	ldrh r1, [r0]
-	movs r0, #0xf0
-	lsls r0, r0, #4
-	ands r0, r1
-	cmp r0, #0
-	beq _08074720
-_08074714:
-	ldr r0, _0807471C @ =0x00000161
-	bl SoundReq
-	b _08074732
-	.align 2, 0
-_0807471C: .4byte 0x00000161
-_08074720:
-	ldr r0, _08074760 @ =gRoomTransition
-	ldr r0, [r0]
-	movs r1, #0xf
-	ands r0, r1
-	cmp r0, #0
-	bne _08074732
-	ldr r0, _08074764 @ =0x00000161
-	bl SoundReq
-_08074732:
-	ldr r2, _08074768 @ =gPlayerState
-	adds r1, r2, #0
-	adds r1, #0x80
-	ldrh r0, [r1]
-	subs r0, #0xf0
-	strh r0, [r1]
-	adds r1, #0x28
-	movs r0, #0x1b
-	strb r0, [r1]
-	adds r0, r2, #0
-	adds r0, #0x37
-	ldrb r0, [r0]
-	lsls r3, r0, #0x18
-	lsrs r0, r3, #0x18
-	cmp r0, #0xef
-	bhi _0807476C
-	subs r1, #0x69
-	lsrs r0, r3, #0x1d
-	adds r0, #4
-	ldrb r2, [r1]
-	adds r0, r0, r2
-	strb r0, [r1]
-	b _08074792
-	.align 2, 0
-_08074760: .4byte gRoomTransition
-_08074764: .4byte 0x00000161
-_08074768: .4byte gPlayerState
-_0807476C:
-	ldr r2, _08074794 @ =gPlayerState
-	ldr r0, [r2, #0x30]
-	ldr r1, _08074798 @ =0xFFFBFFFF
-	ands r0, r1
-	str r0, [r2, #0x30]
-	adds r0, r4, #0
-	movs r1, #0x52
-	movs r2, #0
-	bl CreateFx
-	adds r1, r4, #0
-	adds r1, #0x3d
-	movs r0, #0x20
-	strb r0, [r1]
-	subs r0, #0x24
-	bl ModHealth
-	bl RespawnPlayer
-_08074792:
-	pop {r4, pc}
-	.align 2, 0
-_08074794: .4byte gPlayerState
-_08074798: .4byte 0xFFFBFFFF
-    .syntax divided
diff --git a/src/player.c b/src/player.c
index fef3c5d8..d09ae85b 100644
--- a/src/player.c
+++ b/src/player.c
@@ -3567,7 +3567,53 @@ void SurfaceAction_SlopeGndWater(Entity* this) {
     }
 }
 
-ASM_FUNC("asm/non_matching/player/SurfaceAction_Swamp.inc", void SurfaceAction_Swamp(Entity* this));
+void SurfaceAction_Swamp(Entity* this) {
+    if (sub_080741C4()) {
+        gPlayerState.field_0x11 = 0;
+        gPlayerState.field_0x37 = 0;
+        return;
+    }
+
+    if (this->health) {
+        if (sub_08079C30(this) == 0) {
+            gPlayerState.field_0x11 = 0;
+            gPlayerState.field_0x37 = 0;
+            return;
+        }
+        if ((gPlayerState.flags & 0x80) == 0) {
+            if (gPlayerState.dash_state) {
+                if ((gPlayerState.dash_state & 0x40) != 0) {
+                    gPlayerState.field_0x11 = 0;
+                    gPlayerState.field_0x37 = 0;
+                    return;
+                }
+            } else {
+                sub_08077B20();
+            }
+
+            if (gPlayerState.field_0x37 == 1) {
+                CreateObjectWithParent(this, OBJECT_70, 0, 0);
+                CreateFx(this, FX_GREEN_SPLASH, 0);
+                SoundReq(SFX_161);
+            } else if ((gPlayerState.field_0x92 & 0xf00) != 0) {
+                SoundReq(SFX_161);
+            } else if ((gRoomTransition.frameCount & 0xf) == 0) {
+                SoundReq(SFX_161);
+            }
+            gPlayerState.speed_modifier -= 0xf0;
+            gPlayerState.framestate = 0x1b;
+            if (gPlayerState.field_0x37 < 0xf0) {
+                gPlayerState.field_0x3f = gPlayerState.field_0x3f + 4 + (gPlayerState.field_0x37 >> 5);
+                return;
+            }
+        }
+    }
+    gPlayerState.flags &= ~PL_ROLLING;
+    CreateFx(this, FX_GREEN_SPLASH, 0);
+    this->iframes = 0x20;
+    ModHealth(-4);
+    RespawnPlayer();
+}
 
 void SurfaceAction_Water(Entity* this) {
     if (!sub_080741C4()) {