You can summon the event que, but once what originally was spawned is dead only the small snakes keep respawning, so chain using the egg is required to get the event to keep going, but once he is spawned and you are killing him he just despawns out of no where. Since the event was already not resetting anyway RIP Hakkar Egg quest. Also the blood doesn't always put the flame out when used.
1. Use egg
2. Kill Mobs
3. Nothing respawns
4. Reuse egg as needed
5. Fires when doused dont always get put out
6. Boss spawns
7. You start killing him, Then he despawns randomly without reason?
Maybe when he MCs the tank the target loss bugs him out?, its possible he doesn't retarget and just despawns as if it was a wipe. Similar to Drakkisath in UBRS currently if the kite strat is being used.