Sentence:On October 28, 2003, a [e1]worker[/e1] was using a [e2]hammer[/e2] to tap the arms of a truck's cabstand into a vertical position when the cabstand's arms collapsed in an unintended opposite direction causing the cab to slide off the stand onto the worker's arm.
 e1: worker. 
 e2 : hammer.
Answer: Instrument-Agency(e2,e1)