Big units and afflictions

[HJ]

I was wondering about whether there is a catch incorporated in the game that makes big units more likely to get afflictions? I was playing around with big blood summons, and it would seem that as soon as one of them gets even a scratch, the scratch turns into an arm being chopped off, or an eye being popped out. They all have rings of regeneration or have intrinsic regeneration, and they also have high protection and none of them is cursed. But something like 80% of the wounds, even though they usually take less than 10% of their hitpoints, seem to result in an affliction. Are afflictions tied to the hitpoint loss from the wound, or the attacker's die roll? Because it would, of course, take a very high die roll from your average soldier to do any damage to such units, yet even then the damage with regard to their maximum/total hitpoints is very low. This was also mentioned in one of the threads earlier with regard to giants and their vulnerable eyes.

Btw, what is the base chance to gain affliction from being hit in the first place?

ps. I'm not complaining, I'd just like to know, since it looks kind of odd to get that many afflictions if everything is the same. Maybe I was just unlucky, but then again, maybe there is something to it.