Well, they're not wrong that it changes the AI if they get new skills to toy with and that the extra damage make them to take certain action instead. After all, most games do not have specific AI for every character, they just use the same generic AI that make them take certain action if they have X health, Y damage or Z skill in a pattern.
And from the look at how they try everything they can to avoid the oil puddle I set pre-fight to perma slow all of them and how often it cause them to just cancel their turn, I say that's the case.
