The others worries didn't need justification. Teleportation magic was dangerous if used incorrectly. Otherwise Unicorns would be popping in and out everywhere. Magic in general was very difficult thing to master, even to those with the talent for it. But when it came to Teleportation, the risk of accidentally splinching oneself - or reappearing with missing body parts - was an all too common occurrence among untrained Unicorns.