One student is working to avoid being taken down or immobilized upright against two or more students who use hitting and grabbing and a fourth students walks around them with the goal to place his palm on the back of the head of the first student who wishes to avoid it. The fourth student learns beyond simple paying attention to his partner to move not directly to his target but to swim there where the currents of attention and cones of eyesight and hearing are less evident. This in turn allows the students busy with the physical drill to come back inside themselves and learn that spreading your attention is the best way to grow more of it.
This is a drill to aid you in understanding intention within movement and to avoid showing your intention when you lack awareness of your actions and focus. It can be used for evil but I hope you will choose to see the greater force and freedom it will grant you if you simply do the work without malice. To give in this way is also to receive.