The Doctor peered back over his shoulder to Ace as she complained about her new uniform, "I think...you look very formal" he replied, trying to hold in a laugh by letting out a smirk instead, "But it's not the reason we've come here". Before he could continue, Ace had already blurted out something about them being late, causing The Doctor to roll his eyes and snap his fingers allowing her to exit as he followed her out. Once outside the TARDIS, The Doctor continued, glancing around the hallway to make sure nobody else was watching them, "There's a strong signal emitting from somewhere in this school. Far beyond human capabilities at this time. I need you to go undercover as a student. Ask around, keep your eyes open. I'll find a way in later" he explained to her, stopping as a student walked by, his eyes set on the TARDIS the entire time.
Wasting no more time talking, The Doctor nodded and turned back into the TARDIS, closing one of the doors then popping his head out of the other one, "Remember. Keep your eyes peeled. Ask around. I'll be with you shortly" he said before shutting the door.