Non-stacking priority?

[Sayiain]

Simple question.
What determines which Permanent Immolation ability of 2 separate skills, both Level 1 will work while both affecting the same unit?

Is it damage dealt? I mean the higher/lower?
Is it order of creating skills? The first created skill will dominate the second created?
Maybe order of creating creatures that are using these skills?
Priority of creatures?
Level of creatures?
Anything else?

 

[O.A]

If i remember correctly, pre-placed units with permanent immolation have a priority in which the unit placed before will override the other units P.I, even if its damage is lower. When creating units to a map (with triggers), they don't have this priority, and higher damage should always win. If both P.Is are on the same unit (caster), then the order in which they are in the abilities list will determine the one that will work (higher in the list), even if its damage is lower also. Immolation (the hero ability) should always only check for higher damage.

The thing with pre-placed units is pretty strange, in my opinion only the higher damage should ever work out of two immolations.