Not as small an effect as you think at the distances they're firing the arrows. There's also wind to factor in and that would send the arrow off course or if blowing at it's front slow it down, blow it off course, or both.

My point with the gravity was that it would pull it down, and an arrow in the thigh is a bit easier to get over in the middle of combat than an arrow in your neck.

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What's the gold coins?!?!