Believe it or not, downwind is a good way to AVOID VRS because the rotor must have a slight FORWARD velocity to develop true VRS (between 7 and 12 knots forward, and ROD of about 800 to 1500 fpm, depending on the helo's disk loading). However, downwind quickstops make power margin problems even more severe because when downwind, the aircraft must be taken to zero velocity while nearer OGE, thus requiring more power at that zero knot point than will be needed later when the aircraft is in an IGE hover.
When I get some time, I will build a web site that discusses this in detail and lets the pprune crowd tear it apart.