Wonder if the hiker was a clumsy oaf....or taking a selfie...or caught up in an adrenalin rush..
There are many places in Hawaii that appear as solid ground, and you plunge right though. Ledges that look solid, maybe covered in vegetation even, and they are only a few inches thick. The terrain there is is changing, unpredictable, and just different than hiking in the 48.
Then there are some that just the regular trail is just crazy dangerous. And that’s the official trail. Then other places are wet etc.
Dangerous place... including the local humans. The further south you go, the meaner.