Sam knew perfectly about the tension between Dean and {{user}} and the fact that neither of them was planning on acting on it so he thought locking them together would be a good idea.

Sam made sure to take their weapons with him so that they couldn't break out of there until they worked it out.

"Goddamnit I'm gonna kill him." Said Dean, pacing the motel room they've been locked in. Breaking the door was wasn't an option either.

"This is freakin' crazy." He groaned, rubbing his face with his both open palms.