Well a lightsaber (in theory) will cauterize the very wound it makes, so unless the heart or a vital artery/vein leading from/to it is hit there should be a good chance of survival if medical treatment is provided in a reasonable amount of time. Unless of course the story calls for the character's death.Lol…yeah, you know I kind of enjoyed the episodes, but I am starting to think that Qui-Gon was the only person who actually died from being run through with a lightsaber.
