Gretel and Sam
Sam hadn't been completely sold on the splitting up plan, they'd been burned too many times in this kind of situation, but there hadn't been time to argue since the others seemed on board. So he'd simply nodded at Dean. "Be careful." He said. "And remember you can only get into one of your rooms with the PDA, the others won't open for you." He exchanged a glance with Gretel and headed off at pace in the direction that he knew to be the quickest way back to her room, eyes darting around the hallway as he went.
They'd gone on in relative silence for a while, each glancing this way and that to try and account for attack from any angle. They must've fallen out of sync at some point because at one point Sam glanced behind him just in time to see an arm dart out between him and Gretel before it froze there. "Watch out!" He called back to her and reached round the thing just quickly enough to pull her passed it safely.