The lich bounces around way to much way to fast in the mission. Doesn't stay in one spot for more than a second or 2.
As said elsewhere, the adds being time based like they were originally in the raid puts an unnecessary DPS race on that mob.
I tell my group to burn on the slime, and burn harder (dots and pets specifically) on the lich. We thankfully haven't seen any adds since the first run. The lich should bounce no more than 4-5 times, and causing this to be a terrible event for melee characters is not a good solution.
