TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: To someone's surprise, he unfastens his artificial metal leg and places it on a stand.

SOLUTION: He hobbles painfully towards a chair and sits down.

PROBLEM: The tinted window rolls up and someone sees someone.

SOLUTION: A backseat window rolls down revealing someone inside.

PROBLEM: Someone lies heavily against a pair of hooded shields.

SOLUTION:
Someone flinches against the fierce heat blasting down the tunnel.