That Nasty Old Chicken Wing

A useful ‘Rule Of Thumb’ is that ‘One Lever Assembly’ is straight at all times during the entire ‘Back & Up, Down & Out and Front and Up’ swings. There are only two points when both ‘Levers’ are straight! (Impact Fix – SS #1 and SS #8a through to SS #9)
Note that you can suffer from the ‘Flying Nicklaus Elbow’ at the ‘Top Of Back Swing’ (TOB – Swing Sequence #5) When this occurs, you are very likely to suffer from a slightly ‘Bent Target Lever’. With a little ‘Tongue In Cheek’, this golf teacher is OK with a little lack of this ‘Target Lever Extensor Action’ as long as you get it back through the ‘Impact & Separation Zone’ … SS #7 through to SS #8a and SS #9 … Chase & Follow. (see ‘BOSA’)
The ‘Mirror Image’ of the ‘Flying Elbow’ (TOB) could be seen as the ‘Chicken Wing’. (TOF) We could look at this consideration as a ‘Cause & Effect’ … loss of connection both sides.