He decided it was best not to push the subject, if only not to rise suspicion. Turning to the paperwork, he knew he could not sign the paperwork to open the vault. It would give the goblins his blood, and he could not let it happen. It would hinder their plans if the goblins used it against him, especially if they managed to match the magic in his blood to him when he stormed the bank later on. That would not do.