i will be honest, me, dajuan, and pewpewu all ate a potent edible early in the day that hit me hard during singles
However, I was still in my opinion playing fairly good, but not at my peak, I'd say I played 85%-90% scar played AMAZING so don't take anything away from him
to directly answer your question, I was trying to d a weak dash-attack to catch the up-b so I can do something cool to edgeguard rather than just grab the edge. While I was able to pull it off almost every time in friendlies, I could barely do it when I played Scar for some reason so maybe it was nerves after all.
I am also a pretty stupid/stubborn player and wanted to do it until I get it but it just ends up in me missing even more edgeguards then I already do