It's a default thing. Most (or all?) default clinchers have a failure outcome where the defender gets hit with the attacker's clincher, then gets up immediately and hits their own clincher, and two different success outcomes where the defender stays down and the attacker either goes down as well, or remains standing. I've just made some of them so the failure outcome doesn't hit at all

I have a question: what's the first animation where the opponent does not fall on the combo clincher? Is it a mod, or does it happen in the default game?