The irony was that everything Chuck accused Jimmy of in his "mad rant" was completely true.

My husband and I were convinced that the rapist from the flashback who is bullying Johnno was Al. I think that's what Johnno wanted to tell Robin but couldn't in the end - a man she is trusting now was one of the rapists. After she stabbed Sarge he was probably rightly frightened at what she might do if she knew.