
It's a simple conceptual expansion of Meyer's sign of the sword. The krump as vertical (windshield wiper) confers few (if any) advantages by comparison. Works beautifully from vom Tag or Schrankhut.
Please don't get caught up in precise angles. We are using the sign for broad concepts and ranges of possibilities, not precise angles. What is important here is the concept of the krump, as angling in toward the opponent's openings from the left and above when struck with a step of the right foot (vice versa for the left krump).
Think of the sign here as the crosshairs of your gunsight, and the centre of the sign as your desired target (body part). If you want to strike krump to the hands or arms of an opponent hewing an oberhau, aim this sight (sign) at their arm and strike in this direction with the krump. By the same token, using this concept, it is perfectly possible to strike krump to the head or neck of the opponent.
The key advantage of this, over a directly vertical hew, is that it is always angling in toward the opponent's body, which means, even if you miss your first target, or if you are striking to the flat of the blade, your sword is still angling in toward the opponent's body the whole time, making the follow-up hit even faster. We've found this works beautifully with all the devices in the sources, and unifies the 5 hews conceptually in a logical, practical and beautifully simple way. YMMV.
Cheers,
Bill

