what is the condition of the left wrist in a flip release?
The left wrist is flat through impact.
The flip release is probably the most commonly practiced release in the world. Its simply throwing the hands with the pivot. Any potential arm swing participation is overwhelmed by the shoulder throw against the #4 accumulator. There is no non-automatic version of this release. Because it is an Automatic swinging procedure (6-R-0) the hands do not manipulate the clubface at all. This release will "flip" the Clubface around and into the ball.
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Bagger
1-H "Because of questions of all kinds, reams of additional detail must be made available - but separately, and probably endlessly." Homer Kelly
Another unique characteristic of the Flip Release is that it does not employ an aiming point.
All other Releases fall into the category of Hands Controlled Pivot procedures and utilize an aiming point.
For that reason, it is commonly associated with the Circle Delivery Path (10-23-E) of the hands and Shoulder Turn Throw (10-20-C). Release occurs when the pivot subsides and allows the left arm to begin overtaking the shoulder turn which is simply the release of Accumulator #4.
__________________
Bagger
1-H "Because of questions of all kinds, reams of additional detail must be made available - but separately, and probably endlessly." Homer Kelly