`` pray keep in mind , '' granby said urgently , `` that the thieves will take the very best care of the egg : they have n't stolen it to do it harm , they want a dragon of their own , plainly ; although , '' he added more quietly to laurence , as they went to consult with tharkay , who had already set about examining the trail , `` i do n't know whatever for : i have never heard of men , ordinary men that is , wanting anything to do with a dragon . ''