In GW2, if you tag a mob do you get full loot? Even if you take one swing at it? If so it isn't like WildStar because in WildStar you get loot based on contribution. I could be hearing it wrong, but here is where they say it:
http://www.youtube.com/watch?v=vaKdH...utu.be&t=5m27s
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That system would be an ideal system.