Ok i keep seeing the rotation when using Alter Time as <AM-Blast-AM-Barrage reset> but why use missiles wouldn't just AB spam till Barrage and reset be better dps? cause given whatever situation i am in i can push out 4 blasts and a barrage before AT is up (with EoT/Berserk can push 5 blasts and barrage before reset) and since you return to the amount of mana you had before AT i just don' see the benefit of mixing AM during AT.
BTW i use Hast/Rop w/Frost Armor that prolly makes a difference now that i think about it and if that AT rotation is just for the Mastery build then okies ^.^