Diablo 1 HD Hellfire Mod | Awake

Hi there, so i am enjoying the mod very much but have run into a problem. I am trying to beat Diablo on hell difficulty and the fight seems to be going fine but when he reaches about 50% he despawns and respawns in the middle of the room at full health. Not sure why this is happening?

I have also noticed he does this at random times whenever i teleport or kite him around the room. Has anyone had this happen to them? If so do you know of a solution or work around?

Any help would be appreciated thanks.

When you fight versus boss and leave dungeon level, where is this boss, he automatically have full HP.

There is no solution for this, it is intended to work this way. You have to stay relatively close o him. Whenever you teleport too far away from him or he losses view of you for too long, he will respawn with full health.