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The drone pilot caused that, not!
All it takes to begin such a traumatic event is one pebble saying "Screw this!"
A lot of the time, big landslips happen slow, as creep. Happens a lot in tropical and mountainous countries. I worked one place once where a house literally rode down a slipping hill over the space of a couple of years, staying intact and inhabited. The trees stayed mostly intact, too. It was underdeveloped, so they just had a gravity water tank, but it kept upright. The through road kept getting repaired, and every time I passed by, the house was a little further down.