I have been giving lessons to someone for a few sessions, and a little while back my student told me how my "aiming system" does not work after a certain point. So we both attempted the same shots, after he missed and I made them he just said lets leave it alone , I said the truth is the "system does not break down , You Do. fast forward to today, today no lesson we just played some straight pool .After showing great improvement on ball pocketing (10) fold he cuts this ball in I would have never attempted, I say great shot/ He looks at me and says Great Instructor. I love to witness the Aha moments when giving Lessons !