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dont know if everyone or anyone knows this, but the emp grenade, yes can easily kill the electro boss, but when your team mate uses the box, if you throw one at the box, it makes the box close, hence your team mate loses his gun xD this also works for the pak o punch i believe, wait til they put a gun into the upgrade, then throw a emp and the gun dissapears, try it, have fun guys, zombies ftw!!