Hmm... Well, you could use protect on a character in order to prevent damage from that. After about 5 more deaths that rule won't apply anymore.
Hurt Yuna, hurt Ultimacia.
Fighter - 400
Thief - 400
BlackBelt - 400
BlackMage - 400
WhiteMage - 400
RedMage - 400
Chaos - 450
Firion - 400
Maria - 400
Guy - 400
Emperor - 450
Zande - 400
Cecil - 400
Golbez - 400
Zeromus - 400
Barts - 400
Gilgamesh - 450
Exdeath - 400
Terra - 400
Locke - 400
Celes - 400
Edgar - 400
Sabin - 400
Shadow - 400
Cyan - 400
Gau - 400
Strago - 400
Relm - 400
Mog - 400
Umaro - 400
Gogo - 400
Kefka - 450
Cloud - 400
Vincent - 500
Tifa - 400
Barret - 400
Cid - 400
Nanaki - 400
Cait Sith - 400
Yuffie - 400
Reno - 400
Rude - 400
Rufus - 400
Aeris - 350
Sephiroth - 350
Squall - 400
Zell - 500
Irvine - 400
Rinoa - 200
Quistis - 400
Selphie - 400
Ultimecia - 200
Zidane - 400
Vivi - 500
Garnet - 400
Steiner - 400
Freya - 400
Quina - 350
Eiko - 400
Amarant - 300
Tidus - 300
Yuna - 200
Rikku - 400
Auron - 400
Kimahri - 400
Lulu - 400
Wakka - 400