"Under the table next to the chair you're nearest?" The Master watched John's movement with interest, though he didn't ask why John was rubbing his wrist - or rather, why the wrist he was rubbing appeared scarred. "There's a wrist-strap under there, at least, and Jack has his on."
The rest of the information he'd gotten he turned over in his mind, contemplating how best to use it. Certainly the Doctor wouldn't be too happy to have yet another of his companions snagged out from under his nose - and that it might make Jack happy made the prospect even better.
"Serious talking to be done with whom?" he finally asked, his tone light. "Because if it's the Doctor, that's rather akin to pounding one's head against a wall. Useless, and sometimes dangerous for one's health."