TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: As he straightens up and prepares to jump.

SOLUTION: As it stretches for the railing; it is several inches short of touching it.

PROBLEM: He tries the door at the far end 

SOLUTION: Back at his house someone ventures down a brief corridor.

PROBLEM: A horse tips over backward with a a person on it.

SOLUTION:
A man riding a horse gets bucked off.