Exactly. His hearing Gray banging is game over for the prosecution.
From the short transcript I read, it sounds not so much like he was trying to injure himself as that he was being rowdy. The guy tested positive for heroine and pot (I think it was) So he was high, he wanted out and he did what Bolt did when Bolt was in the dog catcher van (Pixar movie) — he slammed himself against the door to try to jar it open. I’m not saying that was smart. I am saying that’s what a drugged and crazed individual might do.