I have done a fair bit of mushrooms in the past and outside of sore abdominal muscles from constant laughing and hallucinations I don't recall ever getting violent like that nor my friends. It does sound like this guy was on a bad trip but I'm not sure that excuses what he did. Maybe they don't need to throw the book at him but some sort of punishment should be appropriate as she's permanently disabled now and is lucky he didn't kill her.
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