〃You　do　not　think；〃　asked　Phelps；　〃that　he　had　any
  murderous　intention？　　The　knife　was　only　meant　as　a
  tool。〃
  〃It　may　be　so；〃　answered　Holmes；　shrugging　his
  shoulders。　　〃I　can　only　say　for　certain　that　Mr。
  Joseph　Harrison　is　a　gentleman　to　whose　mercy　I　should
  be　extremely　unwilling　to　trust。〃