The tutor on the course strongly suggested we bring colour and in my case more ink to work with. That and charcoal which I think is a fast medium to work with, did seem to be a good idea.
The model also approached the session differently. He still moved a lot and fairly rapidly but his movements were slightly more considered and whilst not repetitive kind of evolved which helped when trying to capture the shape of what he was doing.
To try and get some control I tried to use my paper and the placement of the figure to show where he was in the room.
Then later I constricted the area I worked in and maintained the size of the figure to try and give a sense of constant movement of one person rather than just random figures on a sheet of paper.