I'm an interrupt ranger, the other members were 2 warriors and a monk who left at about 14 minutes. The thing is we didnt have the damage output fast enough.

This is how he worked his skills.

Bonnetti's defense: 75% chance to block and get 5 energy for every block
vigorous spirit: get health for every attack
healing breeze: get health regen
healing hands: get health for every time you get damage, with a cast speed that's impossible to interrupt without being very lucky.

He'd have bonetti's defense up all the time making it hard to hit, and thus interrupt (arrows interrupt only when it's a hit).

I've used chokcing gas: 9 seconds your arrows spread chocking gas which interrupts. But he'd know when I used it because the gas clouds are on him at that time, so he just didnt use any skills, except for bonetti's which is a stance and thus uninterruptible.

Believe me when I say we've tried nearly everything, like not attacking him when healing hands or bonetti was up, but then he'd just healing breeze or start running away... which can also be effective vs 2 warriors.

I'm sure that if we would've had some hard hitters we could've easily won, but we didnt. It was a shame because we had a real good party, and already had 5 or 6 flawless consecutive wins.