 Finn Hudson ( Cory Monteith ) is exhausted by his extra @-@ curricular activities , so Terri gives him pseudoephedrine tablets , which Finn shares with the rest of the males in the glee club . The effects of the tablets enhance their performance , and they give an energetic mash @-@ up of " It 's My Life and " Confessions Part II " . When Kurt Hummel ( Chris Colfer ) tells the girls the secret behind the boys ' performance , they , too , request the tablets from Terri , and give a high @-@ spirited mash @-@ up of " Halo " and " Walking On Sunshine " . Finn and Rachel Berry ( Lea Michele ) feel guilty for cheating , however , and agree to <unk> the competition . When Principal Figgins ( <unk> Theba ) learns what has happened , he fires Terri and , angry with Will , appoints Sue as co @-@ director of the glee club . 
