that happens by returning to u-mos after finishing 2 of his tasks without visiting him between them. it happened to me when i had returned some energy late.
I don't think there's any practical use to it since in order to have bombs to do it you'd have to ILS anyways (thus getting you Space Jump and you can jump the barrier)
i also saw a splinter falling in a secret world... thats really pro xD but it fell down like you when youre in the morph ball mode. i wonder why samus isnt falling when she's unmorphed.
Kinda sucks how this can only be done in this level and in Crossfire Chaos (witch already has a SW that's less annoying). Found/Done by me and ptorflaxendrosis
I found a glitch (I didn't bother to check all the posts to see if someone else found this) where if you are in the air when Mutated Emperor Ing stomps you (because your to close to him) you fly very high.