Why did Leatherface not cut off a good looking mans face?

Have you ever tried throwing a chainsaw with accuracy? It's hard, and it takes years of practice.

Never put distance between yourself and your weapon

1. Does any face look good once it’s been cut off? 2. He didn’t really [i]want[/i] to hurt anybody, he was just crazy and didn’t care.

I'm no chainsaw professional, but don't you need to hold the trigger down to keep the chains moving?