Hmm. Perhaps it's for the best that he doesn't hear it, anyway. If he knows, he might be more apt to head in that direction. That must be what the rest of them decided, he thinks; it would explain a few things.

His head turns toward the hallway—not far enough to see over his shoulder, but enough that the vague impression of Xavier enters his peripheral vision. "You're certain." Despite the intonation, this is indeed a question (and a clear tonal indication that he's well on his way to becoming guarded again).