It didn't really occur to Balthazar that running into an angel in this situation might make Dean think of his recent trauma at the hands of Raphael and Gabriel. Not until that suspicious look, anyway. He's not sure whether he wants to laugh or apologize, so he does neither.

"Not just you. It was large-scale, and I think we may have lost a building." Reaching out, he places a hand on the hunter's arm. Assuming Dean doesn't stop him, he'll fly them into town in the next moment.