"To tell you the truth, the human King was also unable to attack any Kingdom without solid evidence but fortunately this time he already had solid evidence and because of that he could also attack the kingdom anytime.
But if you did something reckless before the king came near this Kingdom then it could be dangerous for every one of you. Everyone of you could also died before the human King reach here. So you needed to promise me that after I free you from that collar, you all won't do anything reckless."
After hearing that everyone of them finally understand why that person telling them not to act recklessly. Naturally they also understand it could be dangerous for them if they act recklessly after getting free. So everyone of the instantly promise him that they will not do anything.