3386  Believing the glee club members are becoming complacent ahead of the forthcoming sectionals , director Will Schuester ( Matthew Morrison ) divides the club into boys against girls for a mash @-@ up competition . Cheerleading coach Sue Sylvester ( Jane Lynch ) observes that head cheerleader Quinn Fabray 's ( Dianna Agron ) performance standards are slipping . When Quinn blames her tiredness on her glee club participation , Sue renews her resolve to destroy the club , planning to sabotage Will 's personal life . 