Lets Talk about assists.
Everybody know that feel when you shoot down a enemy to nearly 1% Health and a mate finish him off with just 1 bullet.
IMO the Person who has done more than 50% Damage on the enemy should get the kill , and the other mate the assist then.
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I think in general, as a rule... People who get the kill, should get the kill... As abstract as the concept of getting a kill is, I think it makes more sense to be awarded for kills you make instead of kills you don't.