Trust me he had a good chin, take a look at the 2nd fight against Eubank where Eubank hit the most picture perfect counter left uppercut i've ever seen underneath Karl's jab and he just shook it off.
I know that was at Cruiser but the punch was so perfect it nearly took his head clean off. He just walked straight through it. With him it was a combo of really good recovery ability and chin. He could recover really quickly after being hurt
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