I recently discovered while doing my weekly Malygos 10 and 25mans (am a combat rogue) that in Malygos phase 1, when he will cast the Tornado on all of the raid (you spin uncontrollably and take 2k damage per sec for 6-8seconds, can't remember the actual duration), as a rogue, you can use Killing Spree on Malygos to free yourself from the cyclone, no damage taken and you can hit Malygos while he is in air casting the cyclone! This would most likely work with Shadowstep too since it has the same mechanism.
As a sidenote, Malygos is a very crucially DPS-intense fight since he has a 10minute enrage-timer and you can't hit him in the whole phase 2 & only drake DPS in phase 3 so this really does probably push the % Malygos is at after phase 1 with like 2-3 with the DPS I am able to put out during the time everyone else is being tornadoed.