You all will have your turn someday.
Every guy here has at one point in their life tried to pee higher, pee farther, hit a target or paint a picture. He has accomplished complete control over his stressors in life and was enjoying a moment.
Or you could say, "need a towel?"
He is probably embarrassed as hell when things go out of control.
The guy has a problem. He knows it. What you saw is unlikely to have been the first time.
....wouldn't have helped him.
That is the only men's room etiquette I know.