Long lateral return for a game winning touchdown as time expires. Flag for what was signaled by the R and announced as a block in the back.
After a lengthy delay, the R comes out and announces -- something -- then comes back and says that the play is still under review.
When the R comes back he announces that the block was from the side, not from the back, and the score is allowed ending the game.
Did I miss the memo that told replay officials to ignore 12-3-6?