In 69, the back end of an LP-type storm is a single cylindrical updraft column. Storms where the whole updraft base is lowered are usually seen in drier regions.
Ordinary updrafts contain no rotation.
As they become stronger and have an organized inflow leading up to them, rotation may exist and this is evident in the circular structure of a wall cloud. The term wall cloud has loosely become associated with any lowering under a severe storm. Initially, the rain-free base has nothing under it. Then, you will suddenly see hunks of scud forming in mid-air under the base, or see tufts of lower cloud extending from the base. More scud forms, rises, then joins the base to form a lowering.