A good drill to learn to relax and do the logical thing in a possible situation. This evening in class I handed out large plastic bags and we sneaked on each other as we walk (An important thing is to avoid any intent and just do the work, otherwise it is noticble in both your work and a tell for the partner) you wrap the bag swiftly over the head of the partner and lead him to a spot (to mimic a kidnapping and so on) and the job is simply to survive and see what doors are open to walk through. One particular way is to ride the arms that are around you to the people around you and feel your way from there.