Mabel does her best flourish like a magical girl wielding climbing equipment- Homura Akemi eat your heart out. She's not a calculated person, but what she lacks in the brains to guesstimate the exact moment it'll open it's mouth, she makes up for in brute strength. The hook catches on the edge of the door, chipping teeth, and Mabel pulls Dipper in close as she hits the repel button, cringing as they began speeding rapidly towards the door's maw.

She shuts her eyes tightly, because if it doesn't work she doesn't want to see those teeth.