If I move a unit to an empty battlefield and my opponent uses Ride the Wind during that showdown to move a unit to the same battlefield, are we both attackers?

Ruling: No, you cannot both be attackers. The first player to contest the battlefield is the attacker, and the opponent is the defender by default.

Sequence:

• The first player moves their unit to the empty battlefield and becomes the attacker
• The opponent moves their unit to the same battlefield during the showdown and becomes the defender
• The battlefield is not contested again if it's already contested

Nuances:

• Even though both players moved units to a battlefield neither controlled, timing determines roles: whoever arrived first is the attacker