A very slight expression of irritation actually manifests on his face, and Rodolphus lifts his free hand and waves it in a 'hold on a second' fashion. He's doing it in the wrong direction but the sentiment is still there.

After a few more moments of thought, he makes another little gesture with his wand and says something in pseudo-Latin, very quietly. It is a spell intended to make everything magical in the vicinity glow — the wards will show up, and perhaps Dean may too, who even knows how compatible this spell is with the way shit in Baedal works. This time, though, he turns around slowly to get a full look at the hallway.