The Master turned to stare at the Doctor. "D'you know, I hadn't even wondered where his TARDIS was. I'm so used to not having mine, now, I just didn't even question it."
Shit, he really was a mess, wasn't he? Time was, the first thing he would have done when meeting his other self was find out if his TARDIS was here and if so make every attempt to steal it.
When the hell had the drums got so much worse that they'd stopped him using his brain?
He gave the Doctor a strange look and said dryly, "You blew his TARDIS up? I'd say you're lucky you're still alive."