Can Fight or Flight be used to move a card back to base when the unit is attempting to conquer Vilemaw's Liar?

Ruling: No, Fight or Flight cannot send a unit back to base when it is attempting to conquer Vilemaw's Liar because the unit is already present at that location.

Nuances:

• Fight or Flight's effect to return a unit to base is prevented when the unit is already present at the location being conquered