Honestly, Jean should have probably expected he couldn't just land a hit. Unlike Reiner, who was a mess mentally, Bertholdt seemed to hold himself together. Well, he did hit Bertholdt, but not as intended, and the next thing he realizes he's on his way to the sand with a yelp.

Despite the surprise, Jean was more than ready to just get back up and keep going, but he didn't have a chance for that, with his wrist still being held and a knee on his back. Which makes him growl just a little bit in annoyance.

Jean toys with the thought of actually retaliating and trying to counter the situation, maybe with magic Bertholdt wasn't familiar with, but instead he sighs, deflating. He tried and failed. He wasn't really in the mood to try again.

"Your name isn't on it yet. But throwing a punch regular isn't violating the pact", Jean says, trying his best not get sand in his mouth. "At least it's out of my system now."