That is the thing about the paper you showed me part of.
It has a microwave generator, and it bounces microwaves all around inside it. They do not leave the contained box, but the box moves forward.
NASA tried to "own" the idea, and say it didn't work. But the word got out that it did. Now they are saying that it is only a small force forward. However, any force, small or not, shows a action, without a equal and opposite reaction.
There is another device that does this. They call it Tesla's Stove. Experimenters find it easy to make a small one, and prove that it works. But they have trouble, mechanically, making a large one. It makes a force upward, with only spinning weights inside it.
According to the diagram, there is nothing impeding the EMF from escaping out the rear. However, it isn't doing something and then nothing coming from it. They claim more of a reaction than I would expect, obviously. That's the opposite of what you stated. Did you just misstate?
Again, that mischaracterizes what is claimed. What is claimed is that the high EMF affects the vacuum pressure and mechanism whereby inertia inures to mass.
I do not have a closed mind about novel mechanisms being potential, and not even those, like the one I posted, that are very outside traditional physics. But, it is factually incorrect to say that something comes of nothing, that action produces no reaction. Cause and effect may break down at some point, but I haven't seen any evidence of it, despite speculation to that effect being a constant.