With Super Smash Bros. Ultimate finally out, we're already starting to see some new tech emerge, and My Smash Corner brings us one that could be a game changer in the form of attack canceling. It's possible to cancel the early frames of any grounded normal - be it a jab, tilt, smash or dash attack - into a jump. It's also possible to cancel a dash attack into a grab.
There are two notable applications for this. For one, attack canceling a dash attack will produce a neutral jump rather than a forward jump like one would normally perform out of a dash, making this useful for spacing aerials with characters like Marth or Toon Link. Attack canceled forward-tilts can also be used to quickly perform turn-around aerials from a standing position.
My Smash Corner goes more in-depth with applications for the technique in the full video - including some character and matchup-specific variations. He also presents a similar technique in the form of Instant Reverse Aerials, a technique comparable in utility to Reverse Aerial Rush, but with an input similar to an attack cancel.
Those familiar with traditional fighting games will likely recognize this as a type of kara cancel - canceling an action's early frames into another action. Usually this is possible due to leniency measures designed to prevent mis-inputs for actions that involve certain button combinations, and it wouldn't be surprising if that turned out to be the case here.