Rorschach : I'm not locked in here with you. You're locked in here with me!

Yeah but he's warning the convicts that they are in more danger than he is.

I didn't find Horshack to be all that intimidating to Mr. Kotter or the rest of the class though.

It's cool line. But rewatching it recently and Rorshach was flattering himself. Those inmates would finish him easily if jump with numbers. Like those police people. They all jumped at him and put him in prison.