Questions about the Heroes 4 map editor.

thank you, it was a good tutorial, I understood it. but can you really not create a battle using only a trigger... or can you?

Added 3 minutes later
And another question: in the scenario, the hero encounters another hero (neutral), and that hero offers to join him. if the main hero doesn't agree, a battle begins, but if he agrees...: the player is given a red hero - and then, for some reason, a battle still starts. and you control both your hero and the newly joined hero.