Task: Story Composition
Input (English): Premise: Dan went to the beach to surf. 
 Initial Context: But suddenly a shark came up near him. 
 Original Ending: Dan was afraid because he never encountered a shark before. Dan wondered whether he should stay or move fast away from the shark. Dan chose to stay and the shark went away. 
 Counterfactual Context: But suddenly an inflatable tube came up near him.
Output (English): Dan was interested because he never encountered an inflatable tube before. Dan wondered whether he should stay and play with the inflatable tube or drag it to shore. Dan chose to drag it to shore.