Sentence:  Indeed we should say , on the contrary , that the accident of our later discovery made no difference whatever to the badness of the animal 's <WSD>pain</WSD> , 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:  a symptom of some physical hurt or disorder