When the tap to his chest comes, Gladio glances out of the corner of his eye but he does come to a stop. There's something important, hopefully what he asked about, that he damn well doesn't want interrupted by a daemon or an MT, plus he can get some of his breath back. He's moving as quickly as he dares with Prompto's weight and the very real knowledge that in this damn maze he might miss Noct and Ignis by seconds. His head tilts, listening closely.

Shit. That is not what he wanted to hear. They're all damn well aware that Ardyn's a madman, though none of them know the absolute extent of it just yet. He remembers Noct rambling on the train about having seen Prompto and Ardyn, a gun drawn, and somehow being tricked and it gives him the willies down into the depths of his soul, like any second he's going to get tricked like that (or like Prompto).

His brows shoot up, then come together hard. "...the hell do you mean, he didn't even blink?" The amount of fear that Prompto must have felt to outright just stab someone, when he damn well knows Prompto is no kind of close-ranged fighter on purpose... "Like you hadn't actually stabbed him at all? It didn't penetrate?" Because those make more sense than the reality his mind hasn't grasped yet.