WASHINGTON — There are collapses, and then there is this.The Washington Nationals were a strike away from beating the Philadelphia Phillies on Tuesday, and blew it. They were a strike away on Wednesday, and blew it again. They held a 5-0 lead on Thursday, allowed the Phillies tie it up entering the ninth, then listened as a crowd of shirtless men throughout the upper deck in right field — “tarps off,” they call it — interrupted a perfect summer night with a sound that this organization will not soon forget.Those who stood in the section yelled and waved their shirts over their heads while chanting “USA” at random intervals. Those who migrated over from a crowd of 28,919 hurled obscenities, as they had all series, including at Trea Turner, who won a ring in Washington and had never received anything but cheers at this stadium.And then, in the top of the ninth, in the middle of the most important at-bat of the season — which for the Nats, was also the most important at-bat of the last five years — the horde chanted “f— Bryce Harper.” In the middle of the chant, Harper whipped his barrel through the zone and hit the go-ahead home run off a reliever making the MLB minimum salary.As the Nationals’ former golden child rounded first, he extended a finger — he said it was obviously his ring finger — and pointed it toward the shirtless crowd that filled the section. As he crossed home plate, one of five Phillies to do so in the ninth inning of a 10-5 win over the Nationals, he held up the digit again.That was moxie from Harper, who told reporters after the game that he loved the vitriol. He had experience with it. Contrast that with the scene from the other side, whose manager was asked after the game whether his relievers have been pitching “scared.”“That’s what it looked like,” Blake Butera said.