Jarrett Jack suffers brutal knee injury (VIDEO)

Worst pain I've ever felt in my life,but we have our obstacles in life not really sure what the extent of my injury is but I'm already in the mindset of getting back and being stronger than ever. Thanks to everybody for the well wishes and keeping me in their prayers.ill be back soon………

A photo posted by Jarrett Jack (@jarrettjack03) on Jan 2, 2016 at 3:45pm PST

Jarrett Jack had to be helped off the court after suffering a non-contact injury to his knee on a fast break, as shown in the Vine below (courtesy of Anthony Puccio).

Jack’s knee buckled under him, and he laid on the court in pain for some minutes before being helped off. The team officially listed him out for the game with a right knee sprain.

Jack has started 31 of a possible 32 games for the Nets this season, averaging 13.2 points and 7.3 assists per game.

According to Andy Vasquez of the Record, Jack is in good spirits, though he won’t know anything for sure until after the MRI.

Jarrett Jack is walking around in the Nets locker room without crutches, albeit very slowly. He's laughing and in good spirits.

— Andy Vasquez (@andy_vasquez) January 2, 2016

Jarrett Jack said he's "optimistic" but not sure extent of his injury. Won't know until MRI "I'm playing the waiting game, just like you."

— Andy Vasquez (@andy_vasquez) January 2, 2016