If you can do that on 3 strings @ the same time you'll get the powerchords like he plays them (he drops his low E to D so) you frets 3 strings to get the powerchords correct)
Thats how I try to play it... It's at a high tempo so you need practice! As for you right hand, just practise to get fast with it! A fast and aggresive right hand is what you need.
Maybe a thin pick helps in the beginning, like a 0.6 or thinner, but you wont get the aggresive sound with a thin pick.