This is copy/paste from reddit/diablo3 so all creds for him. [Monk] How to 2 shot act 4 inferno bosses : Diablo3Strategy
Just sharingStep 1 Equip Mantra of Retribution [Retaliate], Exploding Palm [impending doom], and Serenity [Instant Karma]
Step 2 Have an invincible NPC helper
Step 3 Find a champion pack
Step 4 Activate Serenity
Step 5 Tag the pack with Exploding Palm
Step 6 Activate Mantra of Retribution
Step 7 Die
Step 8 ????
Step 9 Resurrect and pick up your loot