On The Posture Of The Straight Line
This is a somewhat clunky chapter, needing to be partly read with Chapter 3, and suggesting that a good editor would have helped with the structure at this point. There are three distinct sections in this chapter that are not entirely related but also not quite separate enough to warrant their own chapters.
The first section explains what is going on with Alexander in Chapter 3, explaining and finishing the partially complete actions that are carried forward to meet Zachary at first instance. First there is a movement forward that brings the sword up from beneath to meet Zachary in the straight line at first instance, reaching the hilt, with the sword finishing parallel and below. Next are two examples where Zachary is in the oblique angle, meeting him both inside and outside the arm. Finally there is an example where Alexander moves forward without leading with the blade to meet the straight line, which is ill-advised.