Surprisingly enough, you need to do this thing called teamwork in this team based mode. Healers, and their teammates, can be killed in practically two seconds if you coordinate bursts properly on a target. Especially with the new PvP changes where healers do not have as many tools to defend themselves as before. As a healer main I can't believe people are still complaining that they can't kill healers. It's easier than it ever was before.