When you work, you need to be inside yourself and choose where you want to be. If you chase someone or choose your position in relation to someone, than you are controlled and not controlling.
A very simple note about working with a partner. Place both hands at your back and evade as your partner works with his fists on you. Look at all the open air around his fists and all the open ground around his feet. Change places and as you work with your fists look at all the things around you as well as your partner. Vladimir writes in the Systema guidebook to look up to open your horizons and it will be a great release from fear and restriction when you start to see the big picture.