in the Novel the whole thing was different, The Heroines and Isolet (the Teacher) showed up and pursuit Frey inside of the Whole Building, Irina( Mage girl) Started to notice that Frey was following the Flow of Mana in the Building and started to suspect that something was off and other hits before Frey activated the Magic circle pretty much make Clear that he was trying to destroy the magic, the penalty is because Irina Reliazed that Frey was doing a good action, she still hasn't discover the truth yet and still suspect