Jorah brushed her cheek gently with his thumb. Have the doors torn down and make a show of opening their dungeon so that they can see and hear you. Speak loudly and sound as if you are commanding their release. Then go in and call for them, tell them that you are getting them out of that dark hell. Dragons are smart Daenerys, they likely will burn the first things that come into their path other than you. We can leave a few trails of livestock up to the two nests in hopes of them following those trails, but you must be willing to let them out even if they do fly away. Perhaps, Drogon will return once he hears his brothers during the day and night once again." He added as a spark of hope for her. Drogon was by far her favorite and Jorah saw how it pained her when he first left.