"There's a short list of possibilities for the caster, wouldn't you say?" Antonin asked Theo. Round up all the other possibles and question them under a verification spell. Verity included. When you've satisfied yourself that Guilian is the probable offender, let me know, and I'll loose the hounds."
"The wizards I would trust to bring in Dark Magic users would not take time to question him before placing him into a convenient shipping container. I will request that they minimize damage until we have had a chance to speak to the boy. I assume you have tried to contact him about the condition of his brother?"