Btw, at 2:40, is it actually a dungeon boss? Look at the location, there are also some platforms located and Link is in the centre of the big tornado. As far as we know, we also see two airships around the tornado as well. I think those two airships make up the entire wind/ice dungeon and the centre of the tornado is the boss room. It's not the first time that Zelda games have creative uses of some boss rooms in certain dungeons. Personally, I'd really like that.