If an opponent moves Yasuo to my battlefield and I respond with Fight or Flight to send it back to base, does Yasuo's damage ability trigger before being sent back?

Ruling: It depends on whether Fight or Flight is played from hidden or not. If played from hand (action speed), Yasuo's ability resolves first and deals damage. If played from hidden, Fight or Flight resolves first and cancels the damage.

Sequence:

• If Fight or Flight is played from hand: Yasuo's ability goes into initial chain, resolves dealing damage, then Fight or Flight resolves sending Yasuo back
• If Fight or Flight is played from hidden: Fight or Flight resolves first, sending Yasuo back to base before the damage ability can resolve

Nuances:

• The speed at which Fight or Flight is played (action speed from hand vs. from hidden) determines the outcome