I used to have a mod a long while ago, when a ped would be hit by any melee it would trigger the euphoria ragdoll always, instead of the animation.
Without modding, the peds trigger the euphoria when below 30 health, but I've been trying to get it to work no matter the health amount.
Euphoria reaction ( less than 30hp https://gfycat.com/W...ngIndianskimmer )
Normal animation ( https://gfycat.com/A...edLikableFeline )
Found it, incase anyone is looking for it, here it is