Ignis gives him a flat, unimpressed look, complete with a raised right eyebrow.

"If you do, I won't be held responsible for any response you provoke. From Gladio."

And that right there is the direst threat of all. Ignis can lecture, but Gladio gets aggressive. Noct was cruising for a bruising, to put it mildly, if he drove recklessly.

"Come, then. Let's find this poor injured bird. Gladio! Prompto! We're ready!"