THE JAB to the body employed by Floyd and Andre Ward

is this an african american thing? i know fighters in the past have jabbed to the body but these guys REALY punch to the body, looks ****ing painful and you could see Arthur Abraham grimacing last night when he recieved it, especially in round 3. I watch a lot of fights and i honestly have never seen this punch delievered so effectivly except those two. I notice when they punch they kind of twist thier arm a bit, like thier really punching down (like a reverse uppercut, stupid describtion but you know what i mean) and trying to grab something in thier opponents stomach, thought Tarver decribed it perfectly last night, like a syringe to the stomach does anyone know of any other fighters who jab to the body like this? Like, where did Floyd get it from? Pac man's got a good jab to the body but the technique is different and i think its more of a point scoring punch for him