Brush Knee, Twist Step in Self Defense

At the 5:05 mark of my video T'ai Chi Empower - Form and Flow, I begin a series of Brush Knee, Twist Step movements.  

Now watch Rick Marantz demonstrate the martial arts application of this movement:

 

Sometimes you don't have to do much to defend yourself.  Moreover, what you do to defend yourself may be as natural as circling your arm up then down and stepping forward with a hand.