The Asthmatic Dragon is a very worthy opponent and is not one to be trifled with. Even though he is asthmatic, he still has a very powerful breath, followed by a cough with breath that can knock anyone unconscious from the smell. He often is found near caves, active volcanos and other rocky areas. Occasionally, he'll need to use an inhaler and that would be the perfect time to escape if he is found to be too difficult for your hero to handle.
He uses MonsterBook and updates midway through a fight at times and when he does this would also be an ideal time for your hero to escape.