Cas still wants to get closer to Dean and his companion, who have both noticed him now (an understatement, as he is aware that there is currently a lot more of him to be noticed, with the bulk of the wings, which are mostly folded now, but would easily each be at least his own height in length when spread). Despite having a fairly good sense of their shape and bulk behind him, the wings are an encumbrance in this crowded room. And he doesn't want to inadvertently harm anyone with them.

So he pauses for a moment, his brow furrowed in concentration. It takes him a couple minutes and several attempts (not that anyone apart from him can tell, it being an internal struggle), but finally he figures out which mental muscle to flex, and the wings disappear back to wherever they came from.

Finally reaches his small audience - the one he's aware of, anyway. There are probably other people in the room staring at him, but he takes no notice.

"Hello, Dean." He turns to Dean's companion, and offers a nod. "Hello."