"The Skull" Short Story

I have just read "The Skull" by Phillip K. Dick. I really enjoyed this story almost as much as “The Sound of Thunder”. The main character, Conger, is given a chance to get out of jail if he agrees to go back in time and kill a man who would later change the world. Conger agrees to the job and is sent back to 1960 in the U.S. All he has to identify the man is his skull, hence the name of the short story. Conger goes around a small town and gets strange looks from the residents, because no one recognizes him and they question why he is there in their small town. On the day that he is supposed to kill the man with the skull he has, he realizes that the skull he has is his own, because he will change the world because he is a time traveler. The last line of the story goes like “Smiling, Conger awaited a death foreordained.” I think that is a great way to end the story. It is an ambiguous ending, but it isn't at the same time. This theme in time travel seems to occur a lot along with going to the past and changing one thing and going back to the present and things being messed so they go back and fix what they changed the first time so everything in the present goes back to normal. What I mean by this theme is going back and finding out that you do something that makes the future the way it is. I have noticed that most of the time travel entertainment pieces don't have ambiguous endings. And if they do, they aren't like "OMG what is gonna happen?". It's more of the "I can totally guess what would happen next." thing. Come back soon!