What is that lightsaber doing there?

well rick macculm said that in episode3 that anakin was going to have things come off in the starwars insider magazine so if he dropped his lightsaber maybe he had hand cut off.

i think i know what happens.

obi1 makes anakin drop the saber and go's for a cheap shot with his saber. this can make anakin fall into the lava. then obiwan see's anakins saber picks it up and leaves.

I agree with you Sacrifise

Probably Anakin loses his lightsaber,then he fights with Dooku's lightsaber.

i think his arm might have been cut off again.