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Fighting with an ex is never fun, especially when that fight includes the phrase, "Put the scalpel down!" and when not one but two lives at stake.

That's the latest very tense scene coming out of Seattle Grace Hospital, as you can see from the sneak peeks of this week's big conclusion to the Grey's Anatomy-Private Practice crossover.

Below, we have a Buffy and ER alum hearing a phrase no new mom wants to hear on Private Practice...

The thrilling conclusion to the big Grey's Anatomy-Private Practice crossover event airs Thursday at 9 p.m. on ABC.