I tried again and I'm now 100% sure I know how it's done.
It's just very complicated (you need to do something really difficult while avoiding stuff that harms you), so I die during doing it. :/
All in all I can say it might also be partly due to the controls.
Controls on the Gamecube game were definitely better.
I'll probably be able to do it after a few more tries, but it's quite ridiculous for a first boss. :P
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