A slight exhale; she doesn't trust him but he wants to know - especially with now with the escalation of things. With how this looks like something the Cybermen would do - what is this? And hearing there's a room full of that somewhere he really doesn't like. What if Rose is down there?

He feels his hearts take turns skipping a beat.

"Close. It's -", Richard cuts him off; but does grin on how both of them are clever. He does see Richard's signal to back off but -

"Listen - we're all working together to save people. People we care about. If you know something that would be helpful; please," with an undertone of listen to reason and trusting voice; "I'm here to help but I can't help to my best ability if you don't tell me."