Number 1 - Play on your neighbor's WiFi!
Number 2 - Throw a skip grenade in the opponent's general direction for a free, unavoidable 90% health reduction.
Number 3 - Use the Last Word to jump at your opponent and hold down the trigger. You only need to hip fire and shoot in their general direction to kill them faster than any other weapon by far.
Number 4 - If this fails, just go invisible beforehand and you will win.
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I promise you, blind firing with last word doesn't win you gun fights. You have to aim and land your shots, the people who think it's easy to use are just ass at countering it.