If I use Retreat to remove the target of my opponent's Rebuke, does Rebuke retarget to bounce their own unit?

Ruling: No, Rebuke will not retarget. When Rebuke is played, the target unit is chosen and locked in. If that target is removed (such as by Retreat), Rebuke will fail to resolve but will not select a new target.

Nuances:

• The target selection happens when Rebuke is played and cannot change afterward
• If the original target becomes invalid, the spell simply fails rather than finding a new target