Task: Story Composition
Input (English): Premise: Tom was at a campfire. 
 Initial Context: He was using his pocket knife. 
 Original Ending: He set it down and lost track of it. He found it again and took it back. Unfortunately it turned out to be someone else's knife. 
 New ending: He set it down and lost track of it. He found it again and took it back. Unfortunately it turned out to be someone else's canteen. 
Output (English): He was using his canteen.