Eike Schroter/ABC
Natalie Abrams
April 16, 2015 AT 11:58 PM EDT

Why didn’t Cruella and Ursula protect baby Lily after going through the portal to the real world?

That question will finally be answered during Sunday’s episode of Once Upon a Time—and Maleficent will not like the answer. To be honest, the reason is pretty cold-blooded, even for a woman who makes coats out of puppies. How will Mal react? Check out an exclusive sneak peek below.

Once Upon a Time airs Sundays at 8 p.m. ET on ABC.

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