Welsh coach Shaun Edwards gives a defensive masterclass on BT Sport, showing in a live pitch demo just how and why the Saracens are so effective at blitzing their opposition. Subscribe: http://bit.ly/17YTeL5 Twitter: http://twitter.com/BTSport Facebook: http://www.facebook.com/BTSportUK Instagram:http://instagram.com/btsportofficial Website: http://sport.bt.com/