what i meant by seeing in the end was that a life of a ninja has only brought murder and death but its only within ones own death that you understand the futility of it all. One of the emotions i tried to get across is the idea that the training has masked the ninja into not really seeing what he is doing i.e. murdering but with this his final killing he suddenly starts to see glimpses of the truth. the rain is symbolic of his emotions and the direness of his situation.