Interesting. I see some significant parallels with the principles I teach in NGA.
1. The simultaneous attack and defense is found in several arts, and each seems to take a different approach to it, a different way they evolve the principle in practice (for us, it's usually most obvious in us stealing the balance or structure in the process of defending).
2. While I do teach meeting force with force early (because they're going to mess up and do it, anyway, so I give them tools there), that principle holds true, and the force-on-force is only seen in experienced students as a recovery from a blown movement.
3. Blind side is where most of our best work lives, and I like to get close. I refer to this as hiding behind their shoulder. I'm a very creepy teacher sometimes.