[Calahan]

I find Eagle Kings to be one of the most retarded of all units.

Basically they love Iron Skin, but won't ever cast Resist Lightening, even if scripted in the order "Iron Skin" + "Resist Lightening". Most likely the 25% Shock Res value they have left after casting Iron Skin puts them off boosting it to 125%.

Annoying? Yes, but there are many examples like this in the game, so just learn to roll with it.