We had for example one of those crocodiles running away for no reason. ^^
This happened to me with the crocs, the patrolman and the dog, the magisters guarding the palace, the magisters fighting Cork, and the skeletons by the Shrieker and the dog.
It could be that the mobs you encountered simply do not posses skills that are able to outdamage your self healing. I know there are certain specialized mobs in the game like the frogs within the seer's cave which are imune to poison and only have poison related abilities.
Interestingly enough, the frogs simply never used their corrosive acid and just hit me with physical/poison basic attack, but they do about twice as much physical as poison. They actually didn't run away from me.
In the situations where this has happened (the ones listed above) the behavior basically starts happening after I manage to zone myself off with elemental surfaces. Typically I focus melee down first and make them run around a maze of fire to get to me, while separating myself as much as possible from the ranged enemies. After one or two melee enemies are down, the ranged enemies go into panic mode. Maybe they'll attack me once, and then once I set them on fire and poison them, they start running away and from that point on they never attack me again, they just continue running. So, at first I thought this had to do with zombie, but I think it has to do with the AI having so many conditions on them and the DPS I put out. the funny thing is that I'm fairly certain they could've killed me by doing basic attacks. In many situations I had no Physical armor. Also, the healing from Zombie isn't that great, to be honest. (By the way, I was fighting those mobs under-leveled by 1 or at same level, never above)
My build is nothing spectacular:
Talents: Zombie, Elemental Affinity
Combat Abilities: Geo: 3 , Pyro: 2
Attributes: Int: 17, Mem: 14
Skills: Haste, Fossil Strike, Ignition, Contamination, Bleed Fire, Fireball, Spontaneous Combustion, Magical Poison Dart, Fortify, Teleport (gloves), Dragon's Blaze (racial).
For weapons I am still using a starter wand and the wand the big turtle drops in the beginning.
Let's see if this keeps on happening later in the game...I'll keep it posted. And by the way, how would I access battle logs from save files?