"It’s like boost grabbing from Melee only you’re cancelling the startup of the dash attack with an u-smash.
You dash, hit down-C to do a dash attack, then immediately hit up and Z (grab button) to cancel the dash attack with an u-smash.
The boost in speed from the dash attack continues into the u-smash and you slide during it using that increased momentum. I would imagine the ideal timing is when the dash attack propels you forward the most.
- Down-C (starts dash attack)
- Up and Z (grab button)"
This could potentially make some characters REALLY scary…I need to go test out the possibilities of doing this out of a dash dance and doing this to follow up a SHFF’ed normal…