Prompto very well might, so it isn't entirely an unrealistic thought. It certainly feels like he's falling apart as he holds onto Ignis, ignoring his own blood, ignoring their blood, ignoring... everything except the feeling of Ignis' arms holding him together because he no longer could. Maybe, just maybe, they could manage to hold each other together when they're unable to do it for themselves. He trembles from a mix of adrenaline, anger, sorrow, and pain but he doesn't loosen his grip.

"...and now?" he whispers, only barely able to be heard by Ignis because his mouth is close to the other's ear. "Now what do we do?" It hasn't even fully reached his mind that Gladio's gone, or where he went. They need to go and find their King and give him his rest.