I was watching a Mankin DVD and he was talking how taking the barrel back to vertically creates swing plane issues or binds in the wrists. The same thing TM shows, barrel dump?, Mankin called a swing flaw. He said in charting swings it was a flaw and not something you want to happen. This is the same question I asked in another thread. Is it something you want to happen? , or is it a swing flaw as Mankin points out?