Well. Of course that's the only reason.

[A little childish? Maybe. It takes him a long while, but he speaks up again.]

Fine. I might've hypnotized a few people here to go and cause a little chaos around the city a while back, before you got here. Nothing big.

[Hell if he's going to tell the Doctor about his part in the bomb plot. He knows that the other Time Lord won't put up with that. He's still a damn good liar, and he'll make sure that's not found out.]