I was watching this last night and the fight was going very well for Sharkey. He was measuring Max and tagging him. He was really outboxing Schmeling.

In the fourth there was a low blow and the fight was stopped and Jack was DQ'd.

Was this common practice?

4 rounds of great boxing was erased by a blatently unintentional low blow.

It was clear it was not ment as Jack was winning the fight.