Twistaway does 2 things.It flattens or even arches the lead wrist from a cupped address position.This delofts the clubface.
It also prevents the clubface opening up too much due the counter clockwise rotation (twistaway) of the lead wrist and club in unison.
The action of rolling the lead wrist clockwise on the takeaway and cupping the lead wrist goes hand in hand.Rolling the lead wrist counter clockwise(twistaway) will prevent the lead wrist cupping.Just make sure the twistaway doesn't break down at the top and on the downswing.For someone who cups their lead wrist at the top severely,it would feel like you need to arch the lead wrist quite a bit to even get it flat.It may feel awkward at first especially when done with a neutral grip.You really do need a neutral grip
with the twistaway otherwise you will end up pulling and hooking.
Rotating the wrist is the same action as rotating the forearm.You just need to get the direction of the rotation right.
It also prevents the clubface opening up too much due the counter clockwise rotation (twistaway) of the lead wrist and club in unison.
The action of rolling the lead wrist clockwise on the takeaway and cupping the lead wrist goes hand in hand.Rolling the lead wrist counter clockwise(twistaway) will prevent the lead wrist cupping.Just make sure the twistaway doesn't break down at the top and on the downswing.For someone who cups their lead wrist at the top severely,it would feel like you need to arch the lead wrist quite a bit to even get it flat.It may feel awkward at first especially when done with a neutral grip.You really do need a neutral grip
with the twistaway otherwise you will end up pulling and hooking.
Rotating the wrist is the same action as rotating the forearm.You just need to get the direction of the rotation right.