Artemis looked lost for a moment. On the one hand, he did want to tell Haku what had happened--just so he could warn his friend of what might happen sometime in the future; what he might come up against.

On the other, Haku would certainly seek Caleb out if Artemis made it known that it was (probably) a man that attacked him and set the brand on his skin. And after that, who knew what horrible things Caleb would use to torture Haku? Caleb no doubt knew everything about how Artemis thought, including his own insecurities and personal history. Such a monster could hardly be defeated easily.

"No, not someone. Something. It... wasn't human, I don't think. This," He touched the gauze, "Is just a scratch. But it did manage to break my arm when I tried to retaliate. It was very strong, and very fast."

Technically truths.