30 second drawing limit

This was one of the first life drawing lessons I had and looking back at the pictures I can see many faults with my drawings. We were given a time limit of 30 seconds to draw the model in different positions. He began to walk away from me and stopped for 30 seconds at a time, I then quickly sketched the position he was in until he began to move again, I believe I managed to get a sense of movement and time in these sequence of drawings.