NEW YORK — So, worst loss in Cavs history?I suppose the answer lies in what ultimately happens in this series. If, somehow, the Cleveland Cavaliers recover against the New York Knicks, then this one will sink to the bottom of the Hudson River.But being on the wrong end of the second-largest fourth-quarter comeback in NBA playoff history? Sue us if we’re thinking it’s the Cavs with their feet in concrete, plunging into very cold, very dark waters.“We (expletive) blew it,” Donovan Mitchell conceded.Yes. In case you turned off Game 1 of the Eastern Conference finals with about, oh, 7:41 left, turned your phone off and washed down a sleeping pill, the Cavs’ 22-point lead, 93-71, turned into a 115-104 loss in overtime to the Knicks.If this is you, if you did this (IT WAS YOU), well, the moment you hit the power button, the Cavs had a 99.9 percent chance to win. Dating to the 1997-98 season, teams trailing by 22 or more points in the fourth quarter were 1-594.It took a 44-11 run by the Knicks to pull off what they just pulled off.It was an astonishing collapse by the Cavs, filled with obvious mental errors and physical mistakes, questionable strategies all across the board, a smoking-hot Jalen Brunson and, yes, maybe a lucky bounce here or there in the Knicks’ favor.The Cavs seemed to simply allow the Knicks, through Brunson, to target James Harden over and over on defense down the stretch. Brunson scored 15 of his 38 points in the fourth quarter, on 7-of-9 shooting, with only one 3-pointer. Not all those points were scored on Harden, but Cleveland didn’t react nearly fast enough to get Harden help or take him off the floor. The Knicks exploited the matchup.“We adjusted to that,” Cavs coach Kenny Atkinson said, in a respectful but defiant tone. “We started sending two at (Brunson), get the ball out of his hands. … (Harden has) been one of our best defenders in the playoffs. I trust him. Smart, great hands. I didn’t think about (taking him out).”Harden was also brutal offensively in the fourth quarter, missing five of his six attempts from the field. Up until Brunson ignited, Mitchell was the best offensive player on the floor. He scored 29 points but was just 1-of-4 in the fourth quarter and didn’t score in overtime. Overall, the Cavs shot just 5-of-17 in the fourth and 1-of-7 in overtime. They committed five turnovers in the final 17 minutes, but those mistakes weren’t nearly as costly as the bad defense and the stagnant offense, with Harden running isolation and missing shot after shot, then being targeted time and again on the other end.The luck — good if you’re New York, bad if you’re Cleveland — was a 3-pointer by Landry Shamet that bounced on the rim and in to tie the score with 45 seconds left, and a 3 from Sam Merrill at the buzzer in regulation that rolled around the rim and fell out. The Cavs could’ve just as easily collapsed and still won on that Merrill shot, but it didn’t go down.