Scripts

After defeating the hero, a dialogue should start, followed by a cutscene, but instead, the victory is immediately recorded (i.e., neither the dialogue nor the cutscene plays). What's the problem?

It's possible that the victory is automatically recorded upon completing the quest. If you move

SetObjectiveState("obj1",OBJECTIVE_COMPLETED)
SetObjectiveState("alive",OBJECTIVE_COMPLETED)

to the place of Win(), it will probably work. Or, you can delve into the quest settings to prevent victory from being recorded upon their completion.