Re: Does anyone know the name of this?
No problem, but remember that different school and styles frequently have different nomenclature, althougth you will see essentially the same techniques.
Visualizing the technique is good practice; I still do it. Also, acting out both sides of a technique (uke/nage) by yourself is a great way to supplement what you learn in class, and increase your body awareness. To mix it up a little, do this same practice in front of a full length mirror, or in total darkness.