When Ahri (with an attack trigger that gives -2) attacks Yasuo (with a defend trigger), does Ahri's -2 apply before Yasuo's defend trigger resolves?

Ruling: Yes, Ahri's attack trigger applies before Yasuo's defend trigger resolves.

Sequence:

• Attack triggers go on the Initial Chain before Defend triggers
• The chain resolves FILO (First In Last Out), so Ahri's trigger (which went on the chain last) resolves first
• Ahri gives -2 before Yasuo's defend trigger resolves