"Don’t!" Draco shouted, pushing Goyle’s arm to the side. The spell missed them, disappearing into the vast difference of the Room of Requirement. Goyle looked perplexed, but before he could raise his wand again, Harry cast "stupefy’ and then a quick "expelliarmus’, disarming Goyle. The wand clattered to the ground, where Ron snatched it up before either Crabbe or Draco could reach for it or fire their own spell.