The game is Final Fantasy II (IV). The boss is Zeromus. He casts Big Bang and brings my group down to emergency healing! Oh no! The DOT kills all but Cecil and Kain!! Kain uses phoenix down, Cecil casts life. Rosa is up and about to cast Cure 4 when... Big Bang again! Oh no! Everyone but Cecil is dead. Cecil uses phoenix down on Rosa, Rosa and Cecil heal. Rosa casts Life II on Rydia, who uses a phoenix down on Kain, who jumps to avoid the next attack. I have to wait 2 turns, but I finally get Edge up.

I mean... that's just how it goes sometimes. At least rezzes aren't on a 30m timer.