This is both the right note and... not quite right. Miles always does want spectacular successes, and he is haunted by those that are killed under his command (who isn't; Gregor knows that keenly himself) but at the same time...

It's very cavalier. Miles is only cavalier when he's hiding something, or focused on some other goal and subsequently impatient, or... speaking to someone he doesn't know.

"Yes, interesting." But that's all he says for some time, Gregor keeping his gaze focused ahead now, thinking carefully. He's often found that staying quiet invites others to incriminate themselves-- not that he thinks of incriminating Miles, but if there's anyone prone to filling silence, it's him. Normally he makes it look deceptively easy in a way Gregor wishes he could emulate. When he can't, that's another sign to worry.