Pierre Zufferey got lucky on May 29 for a https://newswire.storyful.com/storylines/ */stories/13696">second year in a row after capturing a second video of the annual mud and debris flow rushing down Illhorn Mountain.

The violent flow is triggered by rainfall, which causes the sudden movement of water, mud and rocks. The time of the debris flow is unpredictable, but its full force was captured in this video. Credit: YouTube/Pierre Zufferey via Storyful