knockback; base enemy scene; police van

player/explosion/hit_area.gd

@@ -2,9 +2,8 @@ extends Area3D
 
 func _on_collision(node: Node3D):
 	if node.has_method("hit"):
-		node.hit(null, INF)
+		node.hit(self, INF)
 
 func _ready() -> void:
 	body_entered.connect(_on_collision)
 	area_entered.connect(_on_collision)
-

player/guns/mini_gun.gd

@@ -8,6 +8,7 @@ func fire(aim_angle: float) -> void:
 	player_projectile.damage = 4
 	player_projectile.can_hit_weak_points = false
 	player_projectile.global_position = global_position + Vector3.UP * 0.5
+	player_projectile.knockback_mul = 0.25
 	get_tree().current_scene.add_child(player_projectile)
 	fire_clock = 60. / fire_rate
 

player/projectile/player_projectile.gd

@@ -11,6 +11,7 @@ var health: int = 1:
 			queue_free()
 var damage := 10.
 var can_hit_weak_points := true
+var knockback_mul := 1.
 
 func _on_collision(node: Node3D):
 	if node.has_method("hit"):