Cady, I think we're gonna have to kill her

Shining Armor's daughter has turned evil. She must be stopped at all costs. Meanwhile, Cadance tries to understand where her husband's brain went.

When your daughter dresses in all black, talks to changelings and tells you that life is meaningless, you know she became an irredeemable villain.
She must be killed. Shining Armor knows it.
Cadance says it's just a phase, but he knows.
It's definitely not a phase.