Bosses should not be able to damage you after you killed them

I finally managed to beat Tavakai the Chieftain after ten attempts and then I died from an after-death attack. Please make the player take no damege for five seconds after defeating a boss. It feels very unrewarding to kill a boss and then die and not be able to pickup the loot it drops.

I hate these damaging after effects of some bosses and enemies. I lost a perfect exalted orb in Trial of Sekhemas because of that. It just feels bad.