Kevin Durant was not on the Rockets’ bench as they melted down against the Lakers on Friday night, but Ime Udoka has revealed the reason why. Durant, who also missed Game 1 of this first round series with a bruised right knee, sat out of the Rockets’ 112-108 overtime loss to LA with a sprained left ankle. And as Udoka told reporters in his post-game press conference, the 37-year-old was receiving treatment for the issue during the game. Udoka added on Saturday that Durant, who scored 23 points in his team’s Game 2 loss earlier this week, was running on an underwater treadmill as Game 3 went on. Kevin Durant, seen during Game 2, has played in just one of three games during the series NBAE via Getty Images The Rockets could have badly used Durant’s composure as they blew a six-point lead with 34.4 seconds left in Game 3, as both Jae’Sean Tate and Reed Sheppard committed costly turnovers that led to 3-pointers from Marcus Smart and LeBron James.…