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Richard Jefferson may have old knees, but they can still knock you out if you take one directly to face. 

Dallas Mavericks point guard Rajon Rondo was knocked out of his team's matchup against the Orlando Magic tonight after taking some friendly fire from Jefferson's lower extremities. Rondo, who was already on the ground after a tumble near the 3-point line, took a knee straight to the face as he attempted to pick himself up. Jefferson had his head turned as he began running up the court and never saw Rondo beneath him.

Rondo was removed from the game and will be taken back to Dallas to be re-evaluated. 

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[Via VinnyViner]