Anyhow, first thing he will do is raise a spirit. Fine by me, it helps us both and gives me time to apply poison. Next thing he does is go for ignite arrows. Disrupting shot stops that and poisons him. He went for apply poison, signet to stop that, then shootout with him eating the poison effects.
He did manage to get the poison later in the fight, but it was too late.
Soooooo... just wondering what the myriad of ranger lovers out here have done to defeat the doppleganger, and hopefully help someone out.