Blade Runner

In the movie Blade Runner there is a scene near the end involving Deckard and Roy.  How this scene plays out can be confusing because of how it ends.  Roy ends up dying but he plays out the scene so that Deckard can understand the replicants better and feel empathy for them.  Roy realizes that he is dying while he is going after Deckard so he puts a giant nail through his hand to help slow down the process of his body shutting down.  After meeting Deckard on a rooftop, Roy scares Deckard enough that Deckard jumps off the roof onto another building.  His jump is short and he begins to hold on for his life.  Roy also makes this jump, but successfully this time.  As Deckard begins to fall Roy grabs onto him and pulls him up, saving him.  Deckard is obviously very confused at this point and Roy goes on talking about his memories and such.  Knowing that he has taught Deckard to feel empathy for the replicants, Roy lets himself die finally.  This was an interesting scene because Roy went from being crazy to being nice in an instant.  I think that he did this because since he knew that he was dying he knew he couldn't do much else to change the world directly so instead he spent his time teaching Deckard a lesson so that Deckard has a chance to change the world himself.  He knew that killing Deckard wouldn't accomplish much so he used his intelligence to end his life in the best possible way.