So I have this theory, but I’ve had trouble explaining it.
Like I think a lot of people think that Erik was just flinging those bullets around willy-nilly, that he was being careless, that he didn’t excise enough control over where the bullets went, and that’s why Charles got shot.
But I think Erik absolutely had control over that bullet, and even as angry and distracted as he was, he put it on a very specific trajectory so no one would get hurt by it.
The problem was, he hasn’t realized that Charles was moving, that he was getting up.
So he didn’t lose track of the bullet - the bullet went exactly where he sent it. He was paying plenty of attention to the bullet.
It was Charles he wasn’t paying attention to, Charles who he lost track of, Charles he overlooked.
Bullets are easy. It was the actions of a real and breathing human being (or whatever) that fucked Erik up.
And ain’t that always the way?