We have to remember, Watson, that whatever occurred is certainly something very extraordinary. Well, now, to continue our supposititious case, the couple--not necessarily a guilty couple--realize after the murderer is gone that they have placed themselves in a position in which it may be difficult for them to prove that they did not themselves either do the deed or connive at it. They rapidly and rather clumsily met the situation.
華生，我們一定要想到我們遇到的事無疑是極為特殊的。現在我們繼續把我們想象的案情談下去。這一對不一定是罪犯的人，在兇手逃離後，意識到自己處於一種嫌疑地位，他們既難說明自己沒有動手行兇，又難證明不是縱容他人行兇。於是他們急急忙忙、笨手笨腳地應付這種情況。