You didn't understand. There's an option in the settings called "dynamic combat." Thanks to this feature, each creature has a few seconds to attack.
And in general, they promised to make the battles dynamic, not the game.
P.S. And in general, I suggest rolling back time by two months)))) and not releasing "Heroes 5"))). Why do we need it??))). And then there would be no need to bother with an add-on))).