Here's a question: is it possible to initiate a battle with a hero without directly attacking him? For example: we enter a house as part of a quest, and the text indicates that we encounter a hero, N, as an enemy. How do we initiate a battle with him now?
No, the editor cannot do that. Using a script, the editor can only initiate a battle with a creature, not with a hero. You need to find an alternative solution.