In the original book's chapter The Triumph, The Grand High Witch's own magic is used against her and her followers during their public banquet at the hotel's ballroom, when they are all transformed into brown mice by a massive overdose of Formula 86. It is said that each and every witch has been "smashed and bashed and chopped up into little pieces" by the hotel employees, and that The Grand High Witch was chopped up into pieces by the head chef. In the film, they begin turning into mice with black-and-white fur, except for the fuming Grand High Witch, who is last to be affected as she resists the effects due to her sheer power. She recognizes Helga and attempts to curse her "old adversary" (having perhaps encountered Helga when she was attempting to track down The Grand High Witch), but then Bruno (a boy turned into a mouse) finds the courage to leap onto her cleavage and bite her, which breaks her concentration and she too begins to painfully transform - in her case into a large, nasty, hairless rat. A panic and utter chaos ensues, and the hotel staff members begin to violently take on what they think is a sudden infestation, unknowingly massacring the helpless mice-witches as they run around squeaking. "Her Grandness" herself, in her rodent form and now left without any sort of power whatsoever except still being able to talk even after the overdose, is spotted by Luke, who tells his grandmother not to "let her get away". Frantically pleading "get away from me", she is trapped under a glass water pitcher by Helga, who asks the hotel manager Mr. Stringer to dispose for her of this "especially infectious one". The Grand High Witch ends up unceremoniously executed when she is sliced in half with a meat cleaver in her rat form, finally ending Helga's long conflict, and with the witch population of England now wiped out.