I generally open up with an ambush+explosive probe to the elite, followed by a flashbang. I then do sniper> the non energy building instant you get at lvl 1 till the adds are down, then I use Laze Target and crit snip, then ambush is up and i have the talent point so Ambush has a lower cooldown. Throw in an adrenaline probe if needed, and make sure to use your interrupt if it's casting. Then snipe it down