considering he was looking up local dem conventions and got kicked out of a gun club for being a poor shot... well I think this guy just wanted to prove that he wasn't a complete loser
This might be a legit thing. I don't mean he was an elite sniper who just tried to shoot his earlobe off, but that he intended to miss by a few metres, but he wasn't exactly good at that either.
I thought about this as well, but it was too close. I think it's more likely he missed by much more and trump used fake blood on his hand when he grabbed his ear etc.