I did a library run and the healer died with about 20% left. As the tank I of course as a natural reaction did everything I could do to win the fight without a healer. I end up finally dead with the boss at about 2%, the dps finish it off and I get no exp. Moral of the story, if someone critical like the healer dies and you think it's going to be close, WIPE the party. Do not put in the extra effort to still win. It's not worth the exp loss when that is the only reason you are there.