This at first glance look like one of the social media influencer dance troops that film in public places with total disregard for inconvenience created for pedestrians just trying to get on with their day but it was actually an organized music video shoot to celebrate the Chinese New Year.
The snowboarders were likely told to carve around the dancers and perhaps throw up a little spray to liven things up but an unrehearsed blind side collision ended up knocking them down like bowling pins.
This an excellent reminder to keep your head on a swivel if you standing on an active ski slope or you might get clipped.