True, but in the case of no ground, letting go doesn’t do anything because there is no ground to fall to. I have to throw it somewhere or keep it with me, hence the jet.
The implication made by the author in this article seems to be that under enough gravity, the E and M in light are decoupled, an understanding of which may lead us closer to developing a unified field theory.
I view it as a towel full of water that you wring out. As you twist the towel the water comes out. But if you coat both sides of the towel with a solid coating the water will come out the ends....................