Destiiny needs prone so you can dropshot. It's not realistic if you can't prone cuz how can you hide in the grass then.Guardians can do magic but no prone. That's stupid. Let's tell diejj everyone so they can add it. It's a artsy fix
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The only benifit I could possibly see from prone is in single player long range sniping, or multiplayer camping. Both of those options take away from the fluidity of the game which is most likely why it was not added.