Can you use Dragon's Rage to move an enemy unit back to base (or anywhere) if there's no other enemy unit at the new location?

Ruling: Yes, you can use Dragon's Rage to move an enemy unit even if there is no other enemy unit at the new location. The only initial target required is an enemy unit to be moved. If there is no target for the reflexive trigger (another enemy unit at the destination), then that part of the effect simply won't happen.