When Yasuo attacks Blue Ahri, does Yasuo get -2 attack before or after his ability resolves?

Ruling: Yasuo gets -2 attack before his ability resolves.

Sequence:

• Attacker (Yasuo) triggers are added to chain
• Defender (Blue Ahri) triggers are added to chain
• Attacker gets priority
• Chain resolves LIFO (Last In First Out)
• Blue Ahri's -2 might resolves first
• Then Yasuo's ability resolves and deals damage