During a showdown when Yasuo moves to an occupied battlefield and triggers 'when I attack', can you play actions before the attack/defend triggers resolve, or only reactions?

Ruling: When there are 'when I attack' or 'when I defend' triggers, the showdown starts with an initial chain. During this initial chain, only reactions can be played until the triggers resolve. After the chain resolves and the pile is free, actions can be played by the priority player.

Sequence:

• Yasuo moves to occupied battlefield and triggers 'when I attack'
• Showdown starts with an initial chain
• Only reactions can be played until triggers resolve
• Once chain resolves and pile is free, actions can be played (if you're the priority player)