When interacting with Reavers Row, does the Leona stun occur before the move by the defender?

Ruling: No, the Leona stun does not occur before the defender's move. "When I attack" effects go on the chain before "when I defend" effects, and are resolved after.

Sequence:

• "When I attack" effects (like Leona's stun) go on the chain first
• "When I defend" effects (like Reavers Row's move) go on the chain second
• The chain resolves in reverse order, so the defender's move happens first, then the stun