Oh, I see it now. Was it that spell that seals magic that stopped Explodet damage? In the GBC version, it just stops him from casting any spell, but it appears that in this version, he can still cast spells only to have it fail.
01:57 = super lucky How did you get Explodet to have no effect? Note that I've only played the GBC version, so I don't know if there's any equipment in this SNES remake that can prevent spell damage like that...