If it's just Penemue there, Strange is going to look down at the raven, mutter an audible "Well shit" but still linger a few seconds as he tries to scope out the room for any visible entrances/exits or anything of noticeable importance within the meeting hall itself.

If someone else is there with Penemue (or the moment someone else enters the meeting hall), Strange is getting the hell out of dodge! He might be able to notice anything obvious, large, or impressive, but if there's more than one animal there, he's leaving.