i just don't get the pattern, first the dragon tends to attack closest one( healer Dorca) then it starts to attack the one put lastly
next, correct me if i am wrong but it looks like fangs will absolutely drop from dragon, for the other bonus case (one on the desert, black dragon in cave) it is just by chance, so to assure fang drop we should deal with one has most dragons (blue dragon of the sea or poisonous map)