this is cool.
also a question along similar lines:
can you still load cancel like in melee? (from SWD off the ledge giving you extra momentum)
I haven't been able to land it, but I wasn't sure if that may have just been because the timing in P:M was slightly different or not.
(for those who don't know what I'm talking about:
https://www.youtube.com/watch?v=vdpNVPYuK4c)
I have done 2 things similar to this.
1 which is most relevant is started the charge cycle before reaching the ledge during a SWD.
What happened in my case was my charge had just started, so the momentum was carried through but I didn't even realize what was happening and I died. It was during friendlies. needless to say we paused and laughed our asses of for a minute.
I'm sure if you precharged it like phanna does in the video you posted you could do something similar.
2nd was you just lay a bomb during the SWD. Your momentum is carried in the air. So as far as practical application it's the same imo. I've done this to get some really stylish edgeguards/spikes on my little bro. Salt levels to the max.
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as far as the DWSD that Hylian originally posted about, I've been able to go back FARTHER than where I was initially standing. Including staying in crawl mode so its like speedball from Metroid Zero Mission. lol
here is a video of me doing the technique. I do it like 3 times in a row.