The look he shoots toward Ianto as they pick their way slowly up the stairs says he would rather they weren't talking. He moves up and along the metal hall, then freezes and shoots out a hand to draw Ianto back from the rails.

A voice down below says Are you sure we're on the right level? Then, after a long moment, Where did he go?

Boots click along metal below them, and the device in John's hand seems to show two dots close together, and another three more moving along past them slowly. John holds a finger up to his lips to indicate quiet, and watches the screen for a long moment until they begin to move again. The dots, and the footsteps, vanish off the screen and soon the hallways are silent again.

"Well," John says softly, "we're not going the same direction they are."

Since John isn't strictly sure if this is one of those situations where if you die in the... hallucination? Memory? Whatever this is, if you die in it do you actually die? Easier not to find out, and John doesn't know if he can keep himself and Ianto alive as easily as he could just keep himself alive sneaking around Atlantis. Especially when he's so chatty.