When Yasuo Remorseful's ability and a defender's ability (like Reavers Row) both trigger, does Yasuo have to choose his target before the defender chooses which unit to retreat?

Ruling: Yes, Yasuo must choose his target before the defender makes their choice. Attacker triggers go on the chain first, including all ordering and targeting decisions.

Sequence:

• Attacker's triggered abilities (Yasuo Remorseful) go on the chain first
• Attacker makes all choices including targeting before finalizing
• Defender's triggered abilities go on the chain second
• Defender then makes their choices (which unit to retreat)
• Chain resolves in reverse order (defender's ability resolves first, then attacker's)