Did his friends know that he did it?
In the flashback, Ryan was alone in the room when he kicked Bob. Right after this, his girlfriend takes him home and he says the next morning that he was so drunk he can't remember anything. But it seemed throughout the movie that only his girlfriend was in the dark about who really beat Bob. Also, the fact that Keith didn't turn on Ryan when he was arressted makes it seem like they might not really have known for sure that Ryan was the one responsible for it.
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