I went paintballing last weekend, and, while inspecting my welts, I got around to thinking. Why are they shaped like donuts? They are only red/bruised in a ring, the center seems untouched. You would think there would b some redness, at least, in the center, because that's the spot that first gets hit. or, once the ball hits, does the force spread out as the ball breaks? anyone have an explaination?