Shotguns, nades and a couple of hipfire bullets, melees, rockets, machine guns, Warlock or Titan nukes. There are so many things which kill an arc blade if you dont panic when its coming at you. Shotgun headshots happen on me quite regularly and I do it to others too. The hunter really does have to put the most work in when it comes to supers. They can't just mash it out and insta nuke people like the other classes do.