When defending with Fiora Peerless, can you play Punch First before her Might-doubling trigger resolves?

Ruling: No, you cannot play Punch First before Fiora's Might-doubling trigger resolves because Punch First is an [Action], and only cards with [Reaction] can be played in response to triggers during a Closed State. You must wait until after the trigger resolves and the chain empties, then play Punch First when you gain Focus as the Defender.

Sequence:

• Showdown begins and Fiora is designated as Defender
• Fiora's "When I defend" trigger is placed on the Initial Chain
• Only Reactions can be played in response (game is in Closed State)
• Fiora's trigger resolves, doubling her Might from 3 to 6
• Chain empties and Defender gains Focus (Open State)
• Now you can play Punch First as an Action
• Fiora gains +5 Might for a final total of 11

Nuances:

• Actions can be played "on your turn or in showdowns" but only when the chain is empty (Open State)
• The distinction between [Action] and [Reaction] keywords is critical for timing