[Peter]

I am not aware of the 90/45 concept above, could you discuss a bit more?

I understand this to mean that force at a 90 degree angle can puncture the sphere of defense and attack the mass, while force hitting the sphere of defense at a 45 degree angle will be deflected and leave the mass unaffected. Just think of hitting the edge of a spinning ball - your hand will bounce right off. Thus you attack at a 90 degree angle and try to deflect incoming force by creating a 45 degree angle at the point of contact.

Peter