The Master's eyes narrowed at Jack's words, and he mentally nudged the lobby door, frowning at the throbbing behind his eyes as the door slowly faded into a blank wall - it might not stand up to the sonic blaster the Doctor had, but it would get the message across quite nicely if they headed back to the lobby.
He snorted at the Doctor, and muttered to himself, "You'd have to get close enough to do so first, Doctor."