Sudden collapse

The whumpee might just have realized the existence of an injury, or it's that moment after all the fighting and/or running, when the adrenaline lowers down and their body screams "no more!".

Don't you love the whole: the camera focus on the whumpee, revealing the wound, and they say shakly "I don't feel so good" before collapsing?

The point is... it's a good surprise for us and a scare to anyone around.

Animes
Akatsuki no Yona


 * Ep 14: Ki-ja suddenly collapses from exhaustion after the events on the tunnels, supposedly from digging for an extended period of time.

TV Shows
Merlin


 * 1x05: Lancelot (Santiago Cabrera) saves Merlin from a griffin attack, and both runs for their lives. Once properly safe, still at the woods, Lancelot suddenly faints, blood showing on his side.

The Boys


 * 2x06: Hughie Campbell (Jack Quaid) was inside the van when it went flipping around by an unknown super. He gets out apparently ok... till we (and his friends) see the metal piece coming out of him. There's no time for any words before he collapses.