It's BS that ABILITYS mess up vanquishing blows...
IIRC during the Thor Ragnarok version abilitys didn't get in the way.
If your finishing blow caused bleed or shock you got credit for the death.
Todays mutant medium attack one is expecially rough for me.
I have a 5* x-23, 4* Iceman and 4* archangel.
All three cause either bleed, coldsnap, or poison by many methods.
Going through the proving grounds to get milestones has weak opponents and they die out fast from these abilitys.
If the attack causes the ability directly it should count as a VB imo.
It's already bad enough that it requires like 66-67 matches every freaking day to get full milestone dust. And it's class specific to boot.