Basic physics: Force equals mass times acceleration. A ball of a given mass, traveling a certain speed, will exert a certain amount of force when it strikes another object. If a paintball explodes on impact, some of the force is released outward from the point of impact (which is why there is always a bit of paint splatter), so less force is exerted directly to the flesh right at the point of impact. But if the paintball doesn’t explode, then all of the force is transferred directly into the flesh at the point of impact. Ouch!
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