If the opponent has a 4 Might unit on Reavers Row and I attack with a 4 Might unit, I have priority first. If I pass priority and my opponent chooses to retreat instead of using Reavers, can I still use Cleave after they retreat, or is it too late?

Ruling: Reavers Row goes onto the initial chain in combat. When it resolves, the defender decides whether to retreat. After they decide (whether they retreat or not), the rest of the showdown continues and you can use Cleave then.

Sequence:

• Reavers Row triggers and goes onto the initial chain in combat
• When Reavers Row resolves, the defender decides whether to retreat
• After the retreat decision is made, the showdown continues
• You can use Cleave during the continued showdown

Nuances:

• You cannot use Cleave before the battlefield (Reavers Row) triggers during the showdown