Having picked this game up after about 10 years of not having played it, I do remember two different methods employed by my cousins when they played this game in order to beat these two bosses. One of them leveled up to the point in which he could take Odin down before the timer hit 0 and survive Bahamut's attack. The other simply had Kain jump whenever the countdown reached 2 and let everyone else die. What is the prefered method when fighting these two?