Bring them back. Missed out on a Spear and I'd love to shoot a noob in the knee and kill him.
But seriously, if some people have this perk for the Trials when others don't, then they're at a serious advantage. Especially when they waste their bullets down to the final round
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I don't see why you would empty out mag when you can have a higher possibility of more kills with a full mag. Just one kill isn't too big of a deal, and when they do empty it out, they'll have less special ammo for you to worry about