The Doctor had been pondering his next plan of attack, one that would get him more than a microsecond of data and wouldn't result in him being pummeled or the mummy escaping when Amy offered to give him a hand. While the Doctor could certainly be called stubborn and set in his ways sometimes, what he couldn't be called anymore was an isolationist. If anything, Rose's death had made him that much more willing to accept company and assistance, and the offer shifted his pensive and irritated expression into a cheery grin.
"Fantastic!" The exclamation was accompanied by a slight brandishing of his sonic, holding it up to check to see exactly how much data he'd gotten before turning his attention back to her. "I didn't get too much last time. I'm going to need him to be still for at least three seconds in order to get a thorough inspection. Think you can keep his attention that long before we stuff him back into the closet?"
It might not have seemed long to most people, but the Doctor knew just how vital second were and just how long they could seem in real time. If she wasn't up for it, he could always try the in the closet and close the door behind him method again.