"No. No," Dean says, both to FDR, to reassure him that he's not THAT stupid, and to Other-DR. "There's no playing that game. He's the real one," he says, pointing to the one standing.

"And he's not bad. Little dickish, yeah, but you can trust him just as much as you can trust me. We'll figure this out and fix this."

He promises that just before lightly cutting to see if they're dealing with any of the things that silver hurts (which is a rather extensive list), and he looks so surprised when it's not that.

"... okay, I'm gonna message Sam." Who's probably pissy that Dean's off on another one of his "I GOTTA GO. YOU CAN'T COME" secret missions, but it's still handy to have the nerd look things up.