Reiner notes the jump, and he brings up his free hand to rest it on top of Jean's head. He doesn't mean to be tougher on Jean than he was on Marco. It's just... Marco reminds him of Bertolt and Bertolt had always been good at following the rules and directions. Jean on the other hand, well, he's more like him and Berwick had been. And they had been utter dumbasses at times.

"Exactly. You can stick one down your pants once you are tired of jacking off, cause if that thing goes off, you won't have a dick anymore."