answer: #Person2# tells #Person1# #Person2# killed a pigeon because it spoiled #Person2#'s painting.
documents: #Person1#: My goodness! What happened? You have blood on your face. 
  #Person2#: Oh, don't worry. I just killed a pigeon. 
  #Person1#: How could you have the heart to kill it ? We only have one! 
  #Person2#: It spoiled my painting!