Rules FAQ:
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This event can only cancel an ability with the word "choose" in its text (so it won't work with Tears of Lys, Ghaston Grey, etc.).
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The targeted Stark character doesn't have to be kneeling (standing is not a cost here, unlike with Ser Barristan Selmy).
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You can use this event to cancel your own ability (from an event or a card in play) that targets a Stark character you control, just to stand that character.
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You cannot use this card to cancel the ability of Ser Gregor Clegane or The Tickler (because of the word "Then": when the ability initiates, it doesn't target anything yet, and when it does target, it has already initiated some time before that).
- You can use this card to cancel Intimidate or Stealth (keywords are abilities).