They should have put it in an FMV, but didn't. So they made it so that you had to fight them, to feel Yuna's sorrow of defeating them, and then defeat Yu Yevon, I guess. But um...the reason she had to summon them and then kill them, I have no idea. Cause they are all good before she summons them, and then after, these pyreflies come and they absorb them, and it says "---- Has been brainwashed by Yu Yevon." or somethin like that. The best part about it though, is that you can't die. I loved seeing that puny little angel that looks like Siren from FF8 come! We found it funny when I revived Yuna, Auron, and Wakka xD