Actually, the foot "turn " is a causal effect by the mans rotation to face wall from backing LOD, and "points " to DW with the L foot, whilst the R foots action completes its first part of the journey facing wall ...
.. it is an underturned body action, to allow the lady to complete her rotation ( collecting, as she should ) and hence, the unsual rise during the inside of a turn for man ( a somewhat suspended foot action forming a " bridge effect ).. this preparation enables him to create the necessary" swing " to continue on a fwd path towards DW .
One of the major problems that beginners ( and some advanced ) dancers face, is the "over " rotation by mans body, and an early exit from the turn .
Think of the turn for man, like opening a gate for the lady and allowing her to pass thru..