[bug] first boss grim batol despawned

this seems like the type of thing that happens often on live, but i figured i'd report it.

we kiled the first boss in grim batol barely, the hunter and myself survived. i was killed shortly after by his trogg adds and the hunter feigned death.
the trogg adds did not despawn.
when a party member zoned into the instance the troggs aggroed them and began running that direction, about 30 yards off they despawned along with the boss's corpse.
=no loot