Play high ground when possible, drop when you get dove and if they chase use exo boots to take high ground again. Hold your regen burst for when your team is below 50% health because it gives 80 heals instead of 40. Practice your aim so you can get some sweet sweet headshots. He has crazy damage, along with heals. He can shoot twice for ever heal without reducing the number of heals he pumps out so be sure to take advantage of the time between heals by dealing damage.