Yeah, I remember using the ole Y button in zombies as I revived folks. I'd blast some zombs equipped with phd flopper and a ray gun as I revived people. I didn't have to stand there and get blasted in the face by vex snipers only using one arm.
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As for the subclasses, ice, poison, light (though I think everything is already partially light), darkness, and wind. Water would kind of... eh