Alec swore and then slid in to stand up next to Dean. "Hey, could we all try being reasonable?" He didn't want Sam cutting loose in front of Dean. Not while he was still all adorable little boy all the time.

He, like Sam, caught the double scent. The second one the demon was carrying on his skin was a scent he knew. "Seriously. You go back in there and have a nice evening with Amy, and we'll find a different motel." He knew how captivating she could be. And he didn't smell fear so he figured she was there of her own free will.