Multiple attempts on bosses - what happens if both player and boss die?

I'm looking forward to having multiple attempts at bosses. But I think there's still a frustrating scenario that could happen:




Boss dead, player dead, no loot and probably no re-attempt.

This seems like a problem to me as it makes killing the boss and dying a more punishing outcome than just dying to the boss without defeating them.

I dont think its fair to give players another attempt after seeing the loot as it would be easy to exploit for some builds. eg, see what loot drops, if not good loot then player kills character with infernal flame and tries again.

Maybe we could have portals not close if the boss dies so players can get the rewards? not sure how that would work in an expedition though.