Today, I played and couldn't attack an opponent because of OH. If there were no OH, I could have made a rest move.
Also, I don't understand how to behave when OH is interrupted. Do I need to repeat the moves exactly as they were, or do I have the right to move completely differently? For example, if I merged units and then OH is interrupted. Or, as today, an opponent ran around me, but OH didn't interrupt, but it interrupted when I attacked the opponent (I was blue). If the moves don't have to be repeated, then I could, for example, move other heroes around, maybe even attack some guards to understand their size, and only then attack the opponent and interrupt OH.