Before I begin, just a word of thanks for sharing your expertise with us; as I continue my weight training journey, I find myself gravitating to your ideas more and more; e.g. 100 rep set, 350 method, and the recent 10-6-10.
Intrigued by this latest article, I tried it with a few isolation exercises and I enjoyed it. I decided to look at the time as you were demonstrating, and noticed that the entire set took 45 seconds. In fact, a lot of your recent articles seem to be geared toward taking sets to failure within 40 and 70 seconds TUT. Is failure within that time frame the overriding principle; is it failure regardless of the time (e.g. 20 seconds to fail), or are they two sides of the same coin?