Figure out the intent and fix it.
When watching a pupil hit shots with the naked eye is it really possible to see swing plane/pivot mistakes or does the result of the ball flight give you a clearer indication of what preceeded it. Would you normally video the swing right off the bat or would it be possible to solve problems without the use of video.
Many thanks
Matthew
The sound of impact and ball flight first, which gives me the impact condition.
In combined with the body motion, I speculate what's going on in their mind, which generates that motion pattern.
Then I test my hypothesis by asking the pupil what's in their mond and do something the opposite. If I I got it right, I then give an explanation to the student. If not, I continue the process till it's proved, during which the better the student's information and commitment, the faster the process.
Up to now, there is not much left to be tested.