You can't see your captor clearly in the dark, but you notice in his silhouette has horns and you hear the clopping of hooves along with dragging robes as he approaches.
Minotaur spellcaster? How does that happen?
Phil's the DM. If he wants flying, firebreathing owlbears, then he'll have flying, firebreathing owlbears.
At least he isn't throwing effective goblins at us. Against the minotaur we'll at least die with dignity.