So if you are doing a Siegebreaker run (get 5 Valor Stacks and kill him),
you can just charge him with Furious Charge and you stand in him.
Now you won't get hit by his 3 chain hits and only get the stomp as dmg.
I survive the stomps easily as tank barb and just dps him down.
Hope it helped
Edit1.: Screenshots added
If you take a look at my life I doesn't get hit and you can see where I stand after the charge to/in him