Task: Question Generation
Input (English): Passage: Playing in the snow in Baltimore, the Vikings sought out their first road win of the season. During the first half, Adrian Peterson injured his ankle and was dropped from the game. Despite taking the lead with a touchdown late in the fourth quarter, the Vikings were unable to hold on as the Ravens scored a game-winning touchdown with four seconds left. With the loss, the Vikings dropped to 3-9-1 and were officially eliminated from postseason contention.
Output (English): Which player did not play in the second half?