I disagree that it's a kite fight. The only thing you need to kite is the spirit, and it's very slow and despawns rather quickly. Fist of Justice, move back 15 yards, and keep nuking. The only trouble I've found with the Warbringers is when they have the fear, as it's not interruptible as it is on the Warscouts, so try to bubble the fear if possible. Unbreakable Spirit and the Galakras trinket helps a lot here.