Batman stared down at the boy for a long, long minute, considering his options. There were too many emotions suddenly vying for control inside him, and Batman refused to let that happen. He wasn't ruled by emotion, but by logic, cool and clear. And even if that wasn't strictly true - even if his heart had always led him to do the right thing, above all - it was his head that decided in the end.
He breathed. "The tunic isn't yours, but the colors belong to someone else, as well. Everyone who's worn them has earned the right to wear them, and you have not. If you're going to fight in them, you have to do it my way. That means no sword, no guns, and absolutely no one dies. You do just enough damage to stop them, not permanently injure. If you cannot do that, you will stay here and wait until I'm done."
Batman waited, giving his words a chance to sink in and the boy a moment to decide. "Are we clear?"