So, I'm attacking another enemy castle, and I see that there are only a couple of ghost dragons and zombies inside. The battle starts, and there's Nicholas! Haha! I was really shocked by this AI. I remember when I played through all the campaigns of Heroes 5 on Warrior difficulty, I got my butt kicked by Nicholas in this scenario many times, even though I eventually won. I remember running away from him in the dungeon, from his huge army. Now I'm playing on Hero difficulty, and he's just sitting in his castle with only 2 dragons. This is just ridiculous! :D

Added after 3 hours and 25 minutes
And here's a recording of my final battle with Kolya. He fielded 30 plague zombies against me: DDD. Well, he didn't even get a chance to fight. The archers shot down all the zombies before the battle even started. In general, the mission was a lot of fun, one of the easiest!) PS I'm attaching a screenshot.