Walkthroughs for custom maps.

Question about the Paragon map. I tried playing it once, played at a leisurely pace without getting too involved, and in 2 game months, I didn't even come close to capturing Virill. I consider myself a weak Heroes player, so to speak, an amateur who plays for fun every few months with a friend while having some beer. Therefore, I decided to try playing the map using a Walkthrough to gain some gaming wisdom. =)
In general, the situation is as follows. I downloaded the Walkthrough from the link in this post - /topic/at/858204/
It contains the following words:

You don't need to storm Castle-in-Grief. Just stand there without blocking the passage. The enemy idiot will break free and happily run to grab sulfur, but he will fall into a pit with a thousand fire elementals and, sadly farting with his happy behind, die.

In general, my opponent doesn't want to commit suicide; instead, he persistently attacks my heroes. Explain why this is happening?
Just in case. I am playing The Shadow of Death with the HD mod. I downloaded it from here - https://rutracker.org/forum//topic/5273618/
I updated the HD mod to the latest version available when launching.

I have attached save files – they are attachments to this post.

Also, another question: Is it worth killing the green guy this way at all, or would it be better to level up, defeat him normally, and take the artifacts?