Eren's mouth twitches at the joke but it doesn't form into a smile. Someday. At least he can manage sceptical amusement. It's a step forward, if nothing else.

He can't guess which of them it will be, but in the end it doesn't matter. They're both weapons, so he figures it could go either way.

His eyes move up to Reiner's and he nods, reaching out with a hand to grip the sword as well.

"Yeah. On three," he says. "One. Two…"