"Randomly" would imply without reason or forewarning, would it not?
I will not claim to relish the thought, but to be completely frank I dislike even more the idea of us both being stuck here for goodness knows how long-- and apparently we get no choice in who is to do the "honours".
[Not that he's saying there would be a lot less waffling if he could be the one to punch her... Surely.]
It will neither kill me nor will I hold it against you, Detective - it will be fine. It would hardly be a first time, besides.
[Who would ever want to punch Sebastian in the face, am I right.]