Jeremy Lin knew as soon as he ran back to the court for the second half that something was very wrong. He thought he would play. One way or another, he insisted to Rockets trainer Keith Jones and coach Kevin McHale he could play, even as he was grimacing in obvious pain. Moments later, just as the ball was about to be inbounded for the second half, he was done for the night, knocked out by a bruised chest muscle. X-rays were negative, and he is hopeful that he can return on Saturday for Game 3 against the Thunder, but as with his planned return on Wednesday, he knew it was too soon to say. “This is easily the most frustrating thing that’s happened this entire season,” Lin said. “I’ve been healthy all season. The second half of a playoff game, on the road, we’re playing well, Game 2, it’s just … yeah, it speaks for itself. “It was fine as I was sitting here at halftime. I tried to run out of the tunnel and couldn’t really run. When I did, it would go crazy. We’re supposed to just see what happens tomorrow, how it feels tomorrow. As long as stuff stops spasming, I’m good. I don’t know how any of this stuff works.” Lin received treatment through the second half but never returned to the bench. He was not sure how he was injured, but by halftime he knew it might be more serious than he realized in the first half. “I don’t know who I ran into,” Lin said. “I hit somebody. I thought it would be OK. I came back in for halftime. I put some heat on there and tried to run and couldn’t really run. They’re just saying X-rays are negative. I’ll come in tomorrow and get some treatment.”