Greg's eyes thinned for a moment, the he reared back, his eyes wide.

"M-M-Merlin?" He asked, his voice shaky. "Is... that you?" He shook his head. "B-but... how? I'm just a lowly copper, not some legend that kids read in Secondary School. I thought they were just legends...But.."

He paused and looked over to Sherlock. There was something about him, but... what? He looked back to John with a question in his eyes.

"What about.. Sherlock? I... assume you are somehow freezing this room, or maybe this building.. But... Sherlock.. does he know about any of this?"