The Teacher is NOT a Troll

Dai and Bear are ordinary kids. Well, not totally ordinary. There is the fact that they fight with swords and are training to be knights. And their mother is a dragon-wrangler who works for the fire department. And their dad works for the city council, making sure no one builds a shed over a goblin warren. And they regularly fight monsters. Perhaps they're not that ordinary. Oh, and they're almost certain their headmaster is a troll. There's still some doubt about the teacher though...