If a unit gets targeted by Switcheroo but responds by using Retreat, does Switcheroo still affect the remaining unit's might?

Ruling: No, Switcheroo will not be able to check the might of the Retreated unit. Switcheroo will resolve but will essentially try to swap the remaining unit's might with null might, which won't do anything.

Sequence:

• Unit is targeted by Switcheroo
• Unit uses Retreat in response
• Switcheroo resolves but cannot check the Retreated unit's might
• The swap attempts to occur with null might, resulting in no change