Does Ahri's trigger happen at the 'when I attack' or 'when I defend' step?

Ruling: Ahri's trigger happens at the "when I defend" step.

Sequence:

• Attacking player's triggers enter the chain first
• Defending player's triggers enter the chain second
• Triggers resolve in reverse order (first in, last out)
• Therefore "when I defend" triggers resolve before "when I attack" triggers

Nuances:

• Current rules are unclear on this specific timing
• Future rules will have all attacking player triggers happen at once, then all defending player triggers happen at once