Don't underestimate a legless fighter.
All things being equal, the person lying on the floor grappling doe not need to expend any effort towards maintianing balance. To kick and stomp, you would need be to be close enough to not lose your balance while doing so. The legless opponent may take a few really good shots, but once the stomper falls to the floor, it's all over but the face pounding.
Think about it for a bit... That guy on the floor is not immmobile. Haven't you ever seen a legless person scoot around on their knuckles? The opponent with legs will end up with multiple knuckle sandwiches and eventually, choke on their teeth..
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+++++++++++Boom!
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