It’s not bug, if the fight ends quick without severe damage to both side
you mean severe damage to YOUR side, considering the fight isn’t going to end otherwise…
and, no, that has nothing to do with whether mercy is called or not. It was completely random before the last update. 50/50.
now it’s all blood, all the time.
this is most assuredly either a bug, or else the devs just figured “month of blood” or something and set it to all blood.
on the bonus side, you always get max mp and max loot.
only downside I can see is the few goals that either ask you to get mercy or not kill.