When Switcheroo swaps the might of 2 units and one of those units is killed afterward, does the surviving unit keep the swapped might or return to its original might?

Ruling: The surviving unit keeps the swapped might value. The swap happens once and lasts until the end of the turn regardless of whether the other unit dies.

Nuances:

• The effect applies both positive and negative might modifiers from the swap
• The duration is until end of turn, unaffected by the death of the other unit involved in the swap