I'm enjoying the Blues Guitar Unleashed 2.0 course, but need some help understanding the "Breaks" in the Tore Down rhythm section (Lesson 6) and I the purpose of the "breaks" in blues in general. In the tore down rhythm (example 6.1) the first break is 4 bars long and appears to take the place of the 1st 4 bars (in this case C7), so we drop right into the next two bars which are F7 and continue playing. However, the second set of "breaks" is 8 bars long and yet seems to take the place of the same 1st 4 bars again. Can these breaks be any length desired? What is their purpose. Do they always take the place of the 1st 4 bars, or can they occur elsewhere.