Could be a Ko shot if you accidently on purpose miss their head and catch the side of the neck with your forearm at a 45% angle.
Cross stance outside edge of your wrist bone to the outside of the neck area, possible in some curcumtances.

Confuses the aorta flow with the vena cava flow and the blood to and from the brain gets disrupted.

Much easier without gloves as you use their arm as a runway as you slip their arm and plow in your finger knuckles or extended fingers up and over the runway up the inside of their arm as you head for outside of it.