The Pixels Of Joxon

[Koh]

That's pretty much what I was saying earlier. In terms of collisions, you don't have to change the collision mask at all. You just use a rectangle that tucked inside the bounds of the sprite outline (I'd go even further and say only on the bounds of the body portion, so you aren't getting nicked by the tiniest of pixels, and every hit is clearly visible). Whatever animation that happens doesn't need to affect the collision box.