sorry
The scene is Dean confronting Sam for the first time since becoming a demon (so they won’t see each other again until episode 10.03, folks). Sam talks about hating demons, Dean says “I got a hell of a lot more running through me than demon juice.” Dean has made it back into the Men of Letters bunkers and tells Sam that he knows what he did trying to find him, so which one of them is “really the monster?”. The two are fighting each other in one of the bunker halls after Dean stalks his brother with an axe.