Prompto's known Noctis, even if from afar at times, most of his life. There's three words he would have used to describe Noctis before any others - determined, lazy, and stubborn. Not that the lazy part would have been meant as an insult, because once Noctis' mind is set on something pretty much nothing will stop him, not even himself, but if he didn't have to do something, or he could find an easier way... he was the first to do so.

"I don't intend to," Prompto's says fiercely, the change in his voice suggesting he's staring right at Ignis for suggesting he might otherwise. "It doesn't mean this isn't all- all-" he finds himself surprisingly unable to curse in front of Ignis, even after all of these years apart from him and learning to do so with the hunters that came through.

Then there's a metallic thud - Prompto kicking the elevator wall as it glides silently down into the bowels of the Citadel. He says nothing more until the doors open, only then stepping out and being ready to give Ignis a guiding hand.