Hailed spirit first time - area mobs despawned. Failed due to time but not sure was less than 5% when despawned. Sat for few buffing, etc. Blighted spawns popped so killed them and got to the spirit again to hail.
Midway through fight all spawns popped again which didn't make sense as I was much quicker 2nd time as actually found the crystals and didn't have to res anyone until the spawns started taking out everyone one by one.
Also does the timer start when hailing and he spawns or when engaged?