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.