OK, that is what I thought.

Although you are stepping back into the whisk after 1-3 of a reverse, it is actually a left whisk, so my earlier suggestions apply.
After the twist turn you can step backwards into a back whisk which has the man's RF crossed behind.

CliveHarrison has already answered the rise & fall question.

"Although you are stepping back into the whisk after 1-3 of a reverse, it is actually a left whisk, so my earlier suggestions apply.
After the twist turn you can step backwards into a back whisk which has the man's RF crossed behind."

Let's get this disambiguated:

A LEFT whisk has the man's right foot crossed behind.

Both the normal whisk and the back whisk have his left foot crossed behind.

(The back whisk is basically an alternate beginning to the normal whisk, in that the man steps backwards on the first step rather than forwards)

The named LEFT whisk is not the mirror image of a normal whisk, but instead a line figure more related to the throwaway, contra check, etc. A leftwards whisk with rise that was the mirror image of an normal whisk would be something like the contra fallaway position used in some versions of the three fallaways.

Don't see the problem: the back whisk is danced after the twist turn - is anyone confusing left with back?

The more usual ending would be to dance an underturned outside spin after the twist turn, but a back whisk is OK too.

Sorry! my typo.

I wrote:
"After the twist turn you can step backwards into a back whisk which has the man's RF crossed behind."

That should, of course, have been LF crossed behind

No if you start with the RF then it will be the RF. A back whisk can start with either foot, anyway this is not getting anywhere or helping anyone so I shall move on.

What are you guys on about. We all know what an ordinary Whisk is. It should start facing diagnal to the wall and the LF crosses behind RF.
A Back Whisk can come after a Corte. LF crosses behind RF also. Usually we are going backwards on the first step diagnal to the wall against the LOD.
This can in some cases be a forward step on the same alignment. Not after a Corte though.
The Left Whisk has the man crossing the RF behind the LF usuall diag to wall. This one we do in a Sequence Dance and comes after an Open Impetus and into a Left Whisk. The lady trots around the outside and can go into a Continuous Spin.
Other than that think of it as a Twist Turn.
There is no rise on the Left Whisk. What you do afterwards is up to you depending on the figure.
The Left Whisk should be used as an entry into something more showy. For instance a Continuous Spin clockwise.

Cdroge. If you can find your way to the 06 Professional Foxtrot Final you will see Jonathan Crossley do something simular to avoid a possible collision with a couple bearing down on him.