Well with fafnir you want to stand on both if his front legs as close as you can, only the skillchain people will melee it, and once they get enough TP they will turn away. You dont want to give the dragon TP, he loves to use it! You also should have 2-3 BLMs to magic burst it and they should also stand on the feet. Never fight fafnir from behind... Hope tips help if you have trouble with this annoying dragon...