Sentence:  Indeed we should say , on the contrary , that the <WSD>accident</WSD> of our later discovery made no difference whatever to the badness of the animal 's pain , that it would have been every whit as bad whether a chance passer-by happened later to discover the body and feel repugnance or not . 
Meaning of the word marked with <WSD> tags:  anything that happens suddenly or by chance without an apparent cause