Klay Thompson walks with the help of crutches and his left knee wrapped up after leaving Game 6 due to injury. (0:18)

OAKLAND, Calif. -- Golden State Warriors swingman Klay Thompson suffered a torn ACL in his left knee in Thursday night's Game 6 of the NBA Finals, the team announced.

Thompson was hurt with 2 minutes, 22 seconds left in the third quarter after he went up for a breakaway dunk and was fouled by Toronto Raptors guard Danny Green with Golden State leading 83-80. Thompson came down hard and immediately grabbed the knee while writhing on the floor in pain.

The Warriors ruled Thompson out for the rest of the game, and he left the building on crutches, much the same way Kevin Durant did after rupturing an Achilles tendon in Game 5.

Thompson left the game in the midst of another great performance in the Finals. He had 30 points in 32 minutes, going 8-for-12 from the field and pulling down five rebounds. But it wasn't enough -- the Raptors won 114-110 to finish off a 4-2 series victory and capture their first NBA championship.

Asked what went through his head when Thompson went down, Warriors coach Steve Kerr said, "It's amazement that we're sitting in this position with -- during the game, we have a chance to win the game and force a Game 7, go back to Toronto -- you just think, 'How? How has this group of guys put themselves in position to do it?' And then, as I said, when Klay goes down and is out for the game, it's just sort of a, 'You gotta be kidding me. This has to stop.'

"But it's just -- the way it's gone, I don't know if it's related to five straight seasons of playing 100-plus games and just all the wear and tear, but it's devastating."

Key-lay Piece Missing Late After Klay Thompson exited with 2:22 left in the third quarter, Stephen Curry scored just four points on 1-of-6 shooting (0-4 from 3-point range). The Raptors outscored the Warriors by seven after Thompson left. A look at how Golden State's offense performed after the injury: Player Points after Exit Draymond Green 5 Andre Iguodala 5 DeMarcus Cousins 5 Stephen Curry 4 Shaun Livingston 4 Quinn Cook 2 -- ESPN Stats & Information

Moments after he was injured, Thompson got to his feet, and Warriors big men Jonas Jerebko and Jordan Bell started to help him to the locker room.

After making it about halfway there, Thompson turned around and headed back to the floor to take his free throws. If another player had taken the free throws, Thompson wouldn't have been allowed to return to the game.

Thompson's re-emergence on the floor received a raucous standing ovation from the crowd inside sold-out Oracle Arena.

Thompson proceeded to knock down both free throws, giving Golden State an 85-80 lead as Warriors fans chanted "MVP! MVP!" The Warriors fouled on the ensuing possession to get him back to the locker room to be checked out by the team's medical staff.

"It's just tough in terms of a guy like Klay that left it all out there," Warriors guard Stephen Curry said. "He was playing amazing tonight. And to see a freak play like that where he lands awkwardly. I don't know the diagnosis yet, but you think about the person and the guy and how much he loves to play the game, and that's the only thoughts you have. It's really not about what it means in terms of playing basketball. It's just I'm more concerned about him as an individual."