[NSFW] Last night, BROKENTIER’s MarlinPie showed off some interesting tech for flight characters on his Live_oratory stream. By pressing S and an attack button at the same time when unflying, the character unflies while instantly performing the corresponding normal attack. This nullifies the quarter-circle back motion for the attack button, preventing QCB air special moves from being performed when unflying. Kyohei showcases this trick with Nova, using it for some easy TAC infinite loops.
The glitch can also used to cancel out of normal moves, if the 214S+Attack motion is done during hitstop. This allows for delayed normals, which Kyohei uses to start a TAC infinite with Doom, from mid-screen.
MarlinPie also displayed what he claims to be a non-TAC infinite with Spencer. The infinite simply consists of Zip Lines, but has some strict height specifications, requiring a very low super jump, making it seemingly difficult to perform.