I've got no option but to watch you for the moment. Even if I could let you out of there, I doubt they'd appreciate me killing off an unarmed prisoner. I've got into trouble for that before.

[Not that getting into trouble for something stops him, but he can't help but recall the ribbing he got for that bomb maker shot on his first mission as a double-oh. Bond and M always had their disagreements, but more so back in those days when he was younger and far more eager to prove himself. Nowadays he doesn't have to prove himself.]

Hn, what are we going to do with you, Mr. Silva? [Mostly rhetorical, but he's sure that won't stop him. But it's a valid consideration to make. He can't have Silva being carted off the prison and still be stuck in his own head. It'll ruin his career, even admitting he's got voices in his head, let alone if anyone honestly believed he was a walking security breach.]