When Arthur shows up at Eames' new place, it's with a bottle of scotch in his hand and a touch of doubt in his head as to why he's even bothering at all. They're not really friends after all, but something told him he should at least locate this new house of Eames', get familiar with the territory just in case. In case he has to drive him home after another catastrophe of a party (because there's no way Eames is bleeding all over anyone but his own couch from here on out) or in case he gets a late night call to... well, whatever.

The point is he's here and he's already rung the bell so it's too late to turn around and leave. He'll just have to play at being nice for a little bit until they end up in Eames' bed or Eames kicks him out. At this point both feel equally likely.