Ignis' hold lets up a bit when he realizes that Noct is going to listen to him, albeit reluctantly. It cuts through Ignis' gut seeing him like this and not being able to do anything about it. All he knows is that he can't let Noct risk his life without any backups.

His own legs give in a bit and when Noct slumps forward, Ignis catches him and lowers both of them on the floor, not being able to support them both. Hands wrapped around him tightly.

He wants to say that it will be alright but- he's not sure. Because what Ignis did earlier is the exact same thing Noct wanted to do now. And he feels lucky that it worked.