White Island exploded and killed 22 visitors here in New Zealand in 2019 [1]. As you say, if an eruption starts, run. Video from that day is chilling, with comment made about how different to normal the pools looked.

Those with uncovered skin suffered horribly, and it’s quite surprisingly how little covering was helpful.

There is a good documentary on it [2].

[1] https://en.m.wikipedia.org/wiki/2019_Whakaari_/_White_Island...

[2] https://m.imdb.com/title/tt21439528/