You have to hit your opponent with 6C when j.214214D launches them into the air, no bugs involved. Yeah, it doesn't work all of the times, but like I said, its somewhat hilarious when it does.
Another one (wich is pretty gimmicky) is j.214214D>(wait for the 15th hit to get curse)grab>236236C>Dbug>air combo
Ah, sorry I thought you mean if you could pull it off when they roll teched or something, not just after j.C specifically, my bad.