The crowd at the Maverick Center is on their feet, chanting “U-S-A” in unison, spotlights circle the room, and the tension is palpable. Then with a collective gasp and a wave of the referee’s hand, it’s all over. Countless hours, mentally and physically preparing for this fight and it’s over, two minutes and 45 seconds into the second round. Fighters, bull riders and Olympians recognize this fleeting moment when history claims the winners and the losers. In this case the winner is …