The wrist release is your safety valve.
Traction kites pose the threat of serious injury or even death.
If you should ever run into serious control problems that threaten to drag you off your feet, let go of the bar. The kite will fly away and de-power, but stay attached to you via the leash. The release system does not work properly with tangled lines. Most Kite line has a loop at the end. If yours does, pick up your wrist release cord, and knot the looped line at the end of it.