It'll be less awkward in the long run if Sebastian decides to think that Severus just had a pointless lapse in judgment. He doesn't want to have to explain why he's going into situations blind behaving like an executioner. (There aren't many people he'd have held off for. Who fucking expects Harry Potter?)

"You aren't very funny," he remarks dryly and, finally, he sets aside the list. There's going to have to be an excuse presented to the Death Eater community, and while Severus is inclined to decide, well, the Malfoys are so invested, let them think of a cover - but he's already in with the elder Lucius, and the mental image of them making excuse to each other and slowly catching on is... a nightmare. No, he'll assist. He's dug his grave. Unfortunately.

"Nerve damage of that kind is fixable with a potion." Not many people can make it, he's sure Sebastian knows (or assumes, if it's never been offered to him), but it's a condition he's treated before. "Just looking at you I can see some of the re-healed hexes and cursework that's done improperly I can fix." He makes a bit of a face as he looks over the other man, as if mentally going over how utterly stupid whomever patched him up the first two dozen times was. (That's exactly what he's doing.) "I'd need a closer look at the rest, but nothing sounds so absurd as to be impossible to investigate, at least."