Oh, honestly, stop being so dramatic.

[He pauses, remembering who he's talking to, and makes a face.]

Well. I guess you probably can't, actually. But you can stop expending your life force on ridiculous attacks like that. I'm not going to let you go until you calm down enough to stop trying to kill me.

[He sounds entirely pragmatic about this, and not like he's calmly discussing the Master's attempts on his life. It's the sort of thing he got used to centuries ago.]