I could not find anything that was the same as this so here we go.
In Malygos you will get thrown up in the air by an ability called vortex. Rogues can use Killing Spree to remove them selves from vortex making it so their are less heals needed, as well as they can dps on the ground(while everyone else is still in the air).
Just a little tip I don't think blizzard intended this.