TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: Someone leans out the passenger window and aims a gun at his back.

SOLUTION: As it heads back toward the defiant young man.

PROBLEM: Two of the pairs run down a field of black and green mats.

SOLUTION: A group is gathered in a boxing rink.

PROBLEM: People are sitting at a bar behind them watching them.

SOLUTION:
People are standing by a wall watching them.