If a defending unit is moved to a different battlefield during showdown using Ride the Wind, does the showdown end or continue?

Ruling: The showdown continues as normal with the original defender, even if they have no units on that battlefield. The defender will have a chance to play Actions and can bring the unit back before the showdown resolves.

Sequence:

• Attacker declares attack on defender's unit
• Defender plays Ride the Wind to move their unit to a different battlefield
• Showdown continues with priority passing as normal
• Defender can play additional Actions (like a second Ride the Wind to bring the unit back)

Nuances:

• If the unit returns to the battlefield during the showdown, attack triggers will not go off again (because no attackers went anywhere)
• Whether defend triggers go off again when a unit returns mid-combat is currently being revisited by the rules team