"Who Said You Can't KO With An Upkick?" No one did. They happen all the time. It's not really that rare...L2MMA
upkicks are legal in MMA as long as the guy is not on his knees. If you want a more brutal upkick K.O utube: Mousasi vs Jacare
That was no upkick...
Looked like the Tomahawk chop but with a foot