In the last jedi Rey confronts Luke about what he had done with Kylo Ren. This leads to the two characters fighting with Rey soon pulling out a lightsaber. Luke appears surprised by this and falls backwards. However he doesn't actually touch the ground and is instead left hovering barely above ground. This can be seen in a screenshot here: https://imgur.com/a/b52phEn
After Rey lowers her lightsaber Luke is seen to stop hovering and falls to the ground, as seen here: https://imgur.com/a/oEl8E6G
Since the camera cuts into him both hovering and then falling the rest of the way to the ground there appears to be some importance to this but I can't think what it is. Was the hovering supposed to be some sort of defensive measure? This would be supported by the fact that it stops as soon as Rey doesn't appear threatening (since she lowers her lightsaber). But I can't see how that would be helpful in the situation. Perhaps there is some other explanation?
Why was Luke hovering above the ground during his fight with Rey? What was he trying to accomplish with this?