[SAump]

OBR 7.08 (b) He intentionally interferes with a thrown ball; or hinders a fielder attempting to make a play on a batted ball;
Rule 7.08(b) Comment: A runner who is adjudged to have hindered a fielder who is attempting to make a play on a batted ball is out whether it was intentional or not.
If, however, the runner has contact with a legally occupied base when he hinders the fielder, he shall not be called out unless, in the umpire’s judgment, such hindrance, whether it occurs on fair or foul territory, is intentional. If the umpire declares the hindrance intentional, the following penalty shall apply: With less than two out, the umpire shall declare both the runner and batter out. With two out, the umpire shall declare the batter out.
If, in a run-down between third base and home plate, the succeeding runner has advanced and is standing on third base when the runner in a run-down is called out for offensive interference, the umpire shall send the runner standing on third base back to second base. This same principle applies if there is a run-down between second and third base and succeeding runner has reached second (the reasoning is that no runner shall advance on an interference play and a runner is considered to occupy a base until he legally has reached the next succeeding base).

W/out seeing the video, perhaps ruling on an unintentional trainwreck between runner and fielder. Ruling no intentional interference if the fielder indeed fielded the ball and threw B/R out. Remedy: correcting the hindrance by removing the runner {advantage for defense?}. Note: Remember the A-Rod "interference" play last year when A-Rod tumbled over fielder and both B/R and A-Rod were ruled safe.