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If you watch this part in a big 1080p res, you can see that he is looking/has his head down as he pulls out the saber. The way it is shot sort of seems to me that he doesn't see anything so much as he probably senses someone/something off screen and stops to defend himself/get ready for shit to go down.
I've said this previously but to me it looks like there is somekind of a hatch beneath the snow which possibly leads to a tomb of some sort. It kind of feels like that.