In my screenshot, he's standing right behind me, and he didn't move at all until the end of the battle, only later he somehow took off his armor and stood in his underwear and helmet. And I don't care, honestly, I'm already tired of killing him; he often dies faster than me in most battles.
I think I'll increase the difficulty. What was I thinking? Heroes of Might and Magic on normal difficulty has always been almost exclusively for console players.