Here's the scenario:
The Cleric uses all their uses of
Healing Word for the encounter. Then the Battle Captain Warlord uses
Bolt of Genius (PHB 154) on the Cleric to allow them to use
Healing Word again. How many uses of
Healing Word does the Cleric regain? All of them? Or just one use?
Bolt of Genius reads:
Effect: The target regains an encounter power he or she has already used