If Rell contests an occupied Reavers Row with one enemy unit, and the defender moves back with Reavers Row's trigger, will Rell still get her on attack trigger to play and attach an equipment?

Ruling: Yes, Rell will still get her on attack trigger even if the defender moves back. Once a showdown starts, it finishes even if all units leave the battlefield.

Sequence:

• Rell's on attack trigger goes on the chain first
• Reavers Row trigger goes on the chain second (resolves first as topmost item)
• Defender moves back
• Rell's trigger resolves, allowing her to play and attach equipment

Nuances:

• If Rell attaches Recurve Bow during this sequence, the bow's on attack trigger does NOT activate because Rell has already been given the attacker designation before the attachment happens
• The bow attachment resolves after the defending unit has already retreated in this scenario