Fight!

The ending of the ______ fight remains one of the most controversial in boxing history. Midway through the first round, Y fell to the canvas, in what many have argued was not a legitimate knockdown.The Referee appeared confused after X refused to retreat to a neutral corner. Instead, X stood over his fallen opponent, gesturing and yelling at him, "Get up and fight, sucker!"
The blow that ended the match became known as "the phantom punch," so named because most people at ringside did not see it. Even X was unsure as to whether or not the punch connected, Replays show X connecting with a quick, chopping right to Y's head as Y was moving toward him. However, whether the blow was a genuine knockout punch remains inconclusive.

What happened next?