In pug groups it is recommended to cc Ai after she dashes from the side on the 100%-66% phase. This will give you the maximum amount of time to DPS Ai to 66% stopping some mechanics from overlapping as you go to CC the first Sorrow. On SLB you don't want to delay your
as it will stop you from swapping to Dagger/Torch and dealing as much damage, but you should delay your
if you need to. Ideally Ai's CC bar should break as the Red Agony field spawns beneath her. After 66% you should CC Ai if you can, but it is more important to make sure you have enough CC to break the Sorrows so you don't wipe.