Anyone know much about this? It's something I was taught when I used to do a JKD concepts system a few years ago (I had to stop because of moving and job shifts patterns changing, but I plan to get back into it). I was taught by a guy who was certified under Guru Dan Inosanto and Sifu Richard Bustillo.
Basically 'gunting' is a way of deadening parts of the body (particularly the arms). The principle is similar to aiming for nerve bundles with kicks to the legs (as demonstrated in your anatomy of the legkick videos) combined with Erik Paulson's "Short Shot" techniques. The forearm chop to the leg in one of your videos would also be considered 'gunting'.
It's used a little bit in Wing Chun, but is quite prominent in a form of Pencak Silat from Indonesia.
I mostly used it when clinching with someone. Essentially you work on sliding the blades of your forearms across opponents muscles such as biceps and triceps while in clinch, and using arcing elbow strikes to hit arm muscles E.G. such as a lead arcing upwards elbow (like an uppercut) after slipping a punch to the outside.
It's a great way to sap energy from your opponents arms and make them feel heavy and lacking in 'snap' for punches. It also shows a form of doing damage in the distance between striking and clinching (in the half beat between the two, if you will).
With a lot of focus on leg kicks these days, legitimate attacks to the arms often get overlooked, and while I can't claim you could ever finish a fight with 'gunting' to the arms or body I'm certain it will help you break down your opponent and weaken them for the offense you practice from clinch, of even on the ground.
Thanks for reading.
KJ