Pay 1 Force Choose one of your Droids in the same arena as the attacking unit. The attacking unit now attacks that Droid instead. If the attacking unit has Stealth, Retrieve the Cloak does 3 damage to the attacking unit.
Keywords
Stealth
Stealth: An isolated, static ability that means, "This unit can't be attacked unless it's tapped or has damage counters on it." An untapped and undamaged unit with Stealth can still be affected by alternative types of damage. (Such as Overkill.) As long as the unit has any number of damage counters on it, it can't use Stealth.