- You need to hit the tip of Jab-Jab's hitboxes (When his fists fully extend) to get the running Up-Smash.
Fox's jab 1-2's have different hitbox properties.
- The tippered jabs pop them up and away, at like a 45 degree angle. This is the one that sets up for up-smash.
- Nontippered jabs sends them straight and away, this will not lead to the upsmash if they shield in time.
- The inescapable rapid jab is pretty much the biggest benefit. Jab 1-2 tippered also gives you enough space from characters that can combo break so you can hit them without much worry. Tippered Jab 1-2 into running up-smash trades with Luigi's nair compared to prepatch.
- If you're jabbing on shield, make sure it's spaced well to avoid being punished. You can just back off after the first two if you don't want to commit to something.