darklordoftech said:
It's interesting how open to interpretation Vader letting Piett live is. There's three meanings that I can think of:
1. Vader was distracted.
2. Vader respects Piett.
3. Vader was beginning to move away from the dark side.
I agree that it's (1). The comic book actually says that he walks away thinking about, possibly, the future (which is not the jedi way, according to Yoda).