Huh. Interesting. I haven't encountered this before, but maybe I was just asleep that day.
Well, I have no idea what is taught in ASU. I just know that was what I was always taught, heavily drilled on. We were also taught to keep a bent-kneed stance at all times but after living in Japan, I came to believe that such a habit actually damages the nerves and reflexes. It was one of my earlier teachers who taught that way.