Theo looked at the shop properly and realised that it was just as Remus had said and not as he'd thought at first - vigilance was all well and good, but when it got to the point that he didn't even register his surroundings he was verging on a problem.
"Thank you." he said, for Remus' fforts.
He was surprised at the enquiry, hadn't thought that his former tutor would put any thought into asking, shallow polite enquiry or not. "Passable Sir, thank you, and yourself?" he asked, tentative.