When DingPot takes you to the roof of the lair, Grutilda will say another rhyme about winning, then she will swoop down and try to dive bomb you. When you hear her laugh, move out of the way as far as possible. She will keep this up. When her broom stalls, Rat-a-Tat-Rap her. Every time you do so, she will fire a fireball. Zig-zag to avoid them. Repeat this until she throws a ball that homes in on you. When you hear the whirring sound, turn invincible. Note: She will dive for more times the more you hit her.