I didn't know that it repeated every tick, thanks! I replaced it with an invisible trigger near the entrance to the boss room and a "on collision with character" event and that works just fine.
I am trying to make a final boss enemy fire missiles from his mouth, but the missiles refuse to spawn. I have checked already and it is not a problem with hitboxes or origin points.
Image above: Events that control when the missiles spawn.
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So for context, I am trying to make a game so that the player's gun rotates toward the mouse, but when I try to put (Mouse.X, Mouse.Y) for the "Set Angle Towards Position" action, the word "Mouse" appears in red for both of them.