I dont think i need to explain what shadowstep is seeing most of you knows what it is, but it has its usefullness in diffierent pve encounters.
Maexxna
IF you shadowstep just when you are webbed, when you are flying in the air you will either be webbed under the boss itself, or sometimes not be webbed at all, saves time for people to run and even mana.
Malygos.
You can also shadowstep malygos when he is to throw you up in the vortex phase wich sometimes makes you completely avoid the vortex damage.