NHF – new heroes for Heroes V 3.1.

In a breakthrough, you fight against the AI. It knows where to strike. The player doesn't, and therefore "hesitates."

Okay. Situation in a breakthrough: 1) your unit deals 100 damage with a +5 bonus on a successful hit; 2) your unit deals 150 damage. You need to finish off the dragon in one hit, otherwise – counterattack, its turn, losses, etc. First case: the dragon has 101-150 HP remaining; obviously, it's better to have stable damage of 150 (the second option), as this guarantees a kill, compared to a 50% chance. Second case: the dragon has 151-200 HP remaining; obviously, it's better to have the first option, 100 damage with a bonus on a successful hit, since in 50% of cases the dragon is killed, while in the first option, it always survives.

As they say, if a player hesitates, doesn't know the probabilities, and can't calculate the risks, then that's their personal problem. The one who doesn't hesitate wins. Your Nibros is currently the number 1 pick for Inferno. At least, until the heroes with average skills are reworked.