Dempsey was a bit Tyson - like in that he was faster than the heavyweights of his day .
Tyson could do damage quickly , like when Tyson knocked out the 6 - foot - 6 Fred Fulton in 18 seconds .
Dempsey was a bit Tyson - like in that he was faster than the heavyweights of his day , and he could do damage quickly , like when he knocked out the 6 - foot - 6 Fred Fulton in 18 seconds .