Erry always has a giant cat illusion prepped in their staff, it comes in handy more often than you'd expect. 

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Transcript:

P1: Abby points at Erry's staff reminding they have magical powers.

P2: Erry holds the staff and magical light gathers around them as they cast a spell.

P3: A large illusory cat forms behind them, facing down at the swarm of rats it gives a deep, "MEOW."

P4: Odell and the rats star up at the giant cat in in stunned silence for a moment.

P5: The rats scatter, their fear overwhelming the lapsed control of the flute. Odel shots at the rats, "Hey! Don't run away!"