I am going to assume you mean a fight to the death and not a arguement on who is cleaning the toilet.
Shalim gets the drop of Malificia and quickly kills her with repeated quick strikes.
In his arrogance as a demon hunter he doesnt think to search for mahlifica soulstone.
With his back turned to her he doesnt see her get up.
As she gets back up and summons her succubuss.
Her succubuss charm Shalim as she heals herself by draining his life.
Every time Shalims manage’s to break free of Mahlificia control she either fears or charms him again.
Taking her time to slowly drain him to death.
Question:
If you found sylvanas diary and in it you read how she is obsessed with marrying andiun and forcing him to love her.
You find evidence she started this war purly to force him into marrying her.
What would you do?