The part of him that was so used to hunting down monsters and ripping them apart wanted to believe her. Sam figured that'd be easier. Shrugging, letting her go off and do her own thing. But the thing of it was that Angel hadn't posed as a threat to him or anyone else since he had gotten to the institution. He had been helpful, polite, and pretty decent all around. If the man was a killer, he certainly wasn't interested in killing anyone around here. Besides, at this point, it wasn't like Sam could judge anyone for what they had done in the past. He was no better than a blood-thirsty monster himself. "I don't care. You're not gonna just run off with my holy water and take this guy on. I can't let you do that."
He didn't move forward. Sam would make the effort if she actually left his room, but until she did he was hoping to talk her down. The last thing that Sam wanted to do was fight with her - it'd only land him under some form of punishment by the security around here. He'd be put away in isolation or something equally as annoying as a result. Of course, given that he was being possessed by Lucifer, that was probably a decent thing to consider. Maybe getting himself locked up even deeper in this place wasn't such a bad idea after all. But that was something to consider later. Maybe when he ran out of options. Until then...
"You sure that's such a good idea?" Sam raised a brow, looking across the room at her skeptically. She had almost fallen right over and Sam hadn't missed a single second of it. "You're lookin' a little out of shape if you ask me."