Board Thread:Questions and Answers/@comment-20426317-20131214061701/@comment-9686463-20131215143935

I think it is random and hunting for mags doesn't hurt the others' chances at getting pure. I didn't do the most damage against Scorpio when I claimed him, but when attacking again at the time I claimed his mag, I made sure to only attack once or twice with a team that had at most 3 5* in it. None of them crit so that made sure I didn't do most damage that time too. I wanted everyone that could to hit the pure to be able to enter the random reward roll. :D