He'd been distracted by the voices, he hadn't heard the footsteps until they were in the same room as him and the Doctor. His head snapped round and he sniffed the air, but he didn't know the scent, not really. It wasn't Neytiri or... or Harry, he knew Harry, he did. It wasn't them. It was kind of like the Doctor...
He stepped back into the fog as the footsteps got closer and the voices grew stronger, unsure of who was approaching or what was going to happen.