"It flies well not only on brooms, but also on rum barrels. Especially when it’s burning and ready to explode" (from the instructions of an experienced smuggler to his student).
"If a black witch has got you and you want to burn her with a pulsar, then take ten deep breaths and calm down. Your hands won’t shake, and aiming will be easier" (from a manual for inquisitors).
But if darkness and light do meet anyway—and not just meet, but fate tightly binds them together—then even the director of a magical military academy’s iron self-control can change things.