To be specific, it's one where whichever one it was that died, (and I'm thinking it's Ranma) was killed from an enormous ki-blast. The blast left a scorch on the rockwall.
The one that survived either went mad, and actually thought they were the dead one, or was faking it.
I think Genma was ignorant of it, though He may have been playing along.
I can allready say it is NOT Caress by Materia-Blade, though that was the one that triggered my memories of the one I seek.
It is allso NOT Cast a Second Line into the Sea by Sinom Bre, though that is allso good.
Well, that's all I can recall at the moment, I'll edit or post again if I remember more.



