just keep rooting him, if root doesn't land hit and run.
when he gets 30% hp and root isnt landed again (-_-") he will use frenzy: try run as fast as u can, OR use ultimate defence. If you use it, he will:
1) Hit u with bow (u can use bow too, ur defence will own him, or just keep healing urself)
2) hit you with melee, UD will do it's work defending you, it will looks like you're going to use, but when you have 30% hp use angelic icon and pwn his ass.
This way you may win.