At the start of the Firpo fight?Like you'll see Dempsey falling on the ground trying to punch his opponents. Suppose it was a different sport back then.
Dempsey lunges with a left hook, Firpo steps out of distance and throws a counter right that drops Dempsey to one knee - the way it has been edited removes Dempsey receiving a count.
If not this incident, which one are you referring to? Be interested to watch it.