Writing this, just having been to Freyr, I want to write something on the strong-climbing and ever-guiding "wazige Vinçent" who sometimes pops up in Freyr although he went to live in Germany with his wife and five kids, from where he brings seasoned/yeasted/brewed/fresh/... mysterious food from the garden, as he tells about how he distracts Facebook algorithms with his fake profile, posting Chinese articles, or he may inform us of the healing suck of stones, and sometimes he teaches climbing to convicted kid criminals he sporadically brings, but I'm already writing around the edge of my paper.

Yet this note on Acheronte:
*: On the other hand strange enough the Byzantine encyclopedia Suda calls it the river of healing. Dante's Inferno on its turn describes the Acheront river’s position at an outer circle of l’Inferno. From this point, circle after circle, more villains appear. Then very deep there is this one, trapped in ice, pleased to meet you, hoping you guessed his name and call him Lucifer. How art thou fallen from heaven, O Lucifer, son of the morning! (..the book of Isaiah says of the fallen angel, fed up with Homo Sapiens)

(Adolf Hirémy-Hirschl, 1898)

And this addendum on the intro:
*: English wiki says it's extreme, Dutch wiki writes it's a dangerous risk-taker’s sport.

A paper at RWTH Aachen wrote the dangers of ice climbing weren’t disproportionally high, wohooww.. unless you have a profession demanding a university degree (1.54x avg), or are a student (1.38x avg) or a policemen/soldiers/firefighter (1.25x avg). The pseudo-statistics are gruesome. The subsequent extrapolation to a conclusion is an apparent science-philosophical disaster. Not one that at least temporarily makes sense in your mind, like the ones the Quantum-Zeno Paradox adresses.