It has an extreme case of phantom limb syndrome, so extreme that it takes damage when it's non-existant body is shot!
I will try and make this better by changing the hitbox to fit the hand instead of the body, and do some better spritework. In the meantime I may add an alternative sprite set that shows the body hitbox for convinience sake. But honestly I most likely won't get around to doing any of this anytime soon.
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You need Kyle's Custom Character mod - https://modworkshop.net/mod/24802