It's likely the vacuuming effect. SSB4 has a lot of it to try and keep the opponent in the full attack.
yeah, thats what i figured had happened before i found this thread and learned Roy had a spike on his usmash in melee.
i dont imagine this happenstance—that is, escaping the vacuum to be thrown downward—is easily replicable. it is also difficult to tell if i, as ness, assuming this was me escaping the vacuum and not being spiked, was put in tumble. the competitive applications of this mechanical improbability are decidedly
dubious.
an ironic and entertaining circumstantial parallel, in any case.