I'm on game right now if you want me to show you that there is no splash damage unless you hit a person and even then i'm not seeing if happen every time, I've tested this out on several people. Feel free to warp to me.
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Update:Tried firing 100+ shots into some friends of mine to test this out again, All damage was 13, No aoe,flame or explosion damage.
For the damage to be delt it has to be a direct hit or it does nothing but the gani.