GURPS Star Trek - Martial Arts Techniques

[JulianLW]

Originally Posted by Pursuivant

Knife Hand

Special

Default: Brawling or Karate skill; cannot exceed prerequisite skill.

This is the classic “karate chop;” a quick swinging strike using the side of the hand. Treat it as a Defensive Attack which inflicts -1 point of damage per die.

In spite of its fame, it is not a common technique in 21st century martial arts. Despite that, it appears to be a standard part of 23rd century Starfleet martial arts training.

What does this technique do? Swing damage?

Also, what's the "Gumption" perk?