system
Given the following post, respond as if you're commenting on Reddit:
human
[Star wars tesb] 1. Why did the wampa keep luke alive when it planned to eat him later on; and 2. How did it know to disarm him?
gpt
Wampas prefer meat from a fresh kill, not something that has been dead for hours.  And the wampa didn't disarm Luke, his lightsaber simply fell his belt and landed nearby when he was hung upside down.