Eren almost drops some of it on Bertholdt, just to be a bitch. He thinks several shitty things in a row.

I'll mention you to him after he fucks me next time, he almost says. It's such a near thing. His mouth opens and he has to snap it shut again.

Making choices to be a slightly less terrible person is hard, actually! He manages it for now, swallowing that sentence and any other stupid ass thing he might have said. This kind of restraint won't hold forever. Like so many things, it's only for now, a choice Eren manages because he wants to this time.

"If he hasn't found you by then," Eren says instead, almost dismissive. He might even mean it, if only because it tears Reiner up, what happened to Bertholdt, being here without him. He might not mean it, because he's Eren and he takes his hurt and anger and insecurity out on other people. Everyone eventually gets caught in his destruction, even people he cares about deeply. Especially people he cares about deeply.

"Good luck fixing that wall," he says, a barb on purpose, as he turns to go. For Eren, it's barely anything. It's not even actually scathing.