It's not reassuring, and the way the doctor is speaking to him - like some kind of spooked animal - is grating on his nerves. He's either an excellent liar, or so completely naive as to be pitiable. It's hard to tell.

Still, Khan allows him to approach once more, this time noting the room's exits, the way the Klingon was thinning the crowd, and the notable segment of officers remaining. Like they're preparing to make a scene.

If it's a fight they want, Khan will give it to them. The Vengeance didn't have the power to make it to Starfleet Headquarters, but he could do enough damage here, now. Destroying them like they destroyed his crew would have been fitting, but needs must.

"Then you may start by explaining what ship this really is, because it isn't the Enterprise. I was on that ship not two hours ago. I'll ask again: where am I?"