When Luke gets knocked out and taken by the snow yeti. How come his lightsaber is a ways away from him in the snow. Surely it should have still been on his belt or where he was knocked down.
How did it get there?
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The lightsaber was still attached to Luke's belt after he was knocked unconscious.
The creature dragged him into its cave, then lifted him up to the ceiling.
Given the position of the lightsaber a few feet away from where Luke is hanging, it seems most likely that it either fell off of his belt while the creature was sticking him up there, or was pulled off by the Wampa and thrown aside.
From the film's junior novelisation
He remembered his lightsaber. He reached to his belt, but the lightsaber was gone. Oh, no! Don’t tell me it’s lost! Luke angled his head, and spotted the lightsaber half buried in the snow on the floor below him.
and from the film's original screenplay
Exhausted, he drops back into his hanging position. As he hangs there, he spies his lightsaber lying near a pile of his discarded gear, about three feet out of reach.