Rugby World Cup 2011: Wales' red card the difference - Dawson

BBC Sport pundit Matt Dawson describes the red card shown to Wales captain Sam Warburton as the "catalyst" to France's hard-fought World Cup semi-final victory.

While conceding that the referee was correct to dismiss Warburton, former England star Dawson believes that it was the defining factor in Wales' agonising 9-8 defeat.