^^^ Personally, I thought her choice in hostages was much better here than in the book. IIRC, she held the court jester hostage (Patchface or Butterbumps maybe? Can't remember.) At least, in this version, she chose someone that Walder Frey might have had more of a realistic reluctance to let die and use as a viable leverage to stop the carnage. That made his "I'll get another one" line all that much more shocking (and darkly amusing).