The tractor beam effect could be from the black phosphorus impurities in the sample. That's ferromagnetic so you have two kinds of forces on the flake. Earlier I joked to my friend that this Beijing expert doesn't understand what he was seeing and we shouldn't laugh at his predicament.. an x-ray of his sample probably showed that there wasn't a lot of lk99.
It's crazier. Author claims it's not LK-99, yet both the leviating piece and the chunk that the teazers is holding are from the sample compound.
So what's the attracting mechanism without magnets?