I have read Al's description of his trading system.  It is a variation on a well known system that works very well.  The falling knife issue is not a concern to me under the circumstances with NOT.  As long as I can increase my position according to previously set goals, I end up with more shares that then go to work for me when the SP hikes up again.  It is still so much better than passively watching the SP drop numerous times, watching an abundance of opportunities drift by with out taking advantage of them.  But again, this is not with the core, so it is much easier on the psychology.