[MADRUCKIS]

Yes
Already been tried. See Sephiroth is no punk by the way.
(check the science I have on him already)
You glide to him, you can only have 4 hits. After that, he disapears and shows up behind you to stab you. So flying in, you'll press the button four times and either roll or block (Ipefer block cause it gives me a sense of accomplishment.

BUT IT'S NOT THAT EASY.
See he has an attack that he does when your too close which erupts in flames and hits you hard twice. You have to make sure your not in the vecentiy all the time. Also after some time his apttern changes where he'll call "Sin Harvest" which gives you four options
1) Die unless you have the second chance ability but you need to heal
2) Fly at him with superglide and strike him at the precise time he's saying it for him to stop.
3) Use your strike ability to stop him from saying it
4) Die

Top that off with a beserk move that he strikes you over ten times EVEN in the air-and it only takes about 4-5 to kill you and you have (a long sentence with profanity)