When a combat showdown is initiated by an attacker who plays an action spell like 'Fight or Flight' to push an enemy unit back to base, and the defender plays 'Defy' to counter it, does the attacker have an opportunity to create a new chain with another action spell before combat resolves? Also, if the defender lets Fight or Flight resolve and a unit is pushed to base, can the defender then play 'Ride the Wind' to bring that unit back to the battlefield?

This involves two scenarios:

Scenario 1 (Defy countering Fight or Flight): No, the attacker cannot play another action spell immediately after Defy resolves but before Fight or Flight resolves. While a spell is resolving, the turn is in a Closed State because Fight or Flight is still a Finalized Chain Item waiting to resolve. Action spells can only be played during Showdown Open states, but the state remains Showdown Closed while Fight or Flight is on the chain. Only Reaction spells can be played in a Closed State. The initial chain (Defy → Fight or Flight) must fully resolve first.

However, after the entire chain resolves and the chain is empty, the Showdown returns to an Open state. Focus passes cyclically, and when it returns to the Attacker, they can start a new chain with either an Action spell or Reaction spell before combat damage resolves. This continues until all players pass in sequence, at which point the Showdown closes and Combat Damage resolves.

Scenario 2 (Ride the Wind after Fight or Flight resolves): Yes, this is legal. After Fight or Flight resolves and pushes a unit to the defender's base, the chain is empty and the Showdown is Open. The defender can then play Ride the Wind (an Action spell) to move that unit from their base back onto the battlefield and ready it. Ride the Wind has no location-based targeting restrictions—it's a straightforward Move effect. The unit at the base is a legal target, and moving it to a battlefield the defender controls is a valid move.