1- Protect - secure the zone
When an accident occurs on the ski slope, the first thing to do is to protect the victim as well as the other skiers. Your aim is to avoid another accident, worsen the victim's injuries, or find yourself in an accident too.
A simple way to warn other skiers to slow down and be careful when arriving in the area of the accident:plant your skis forming a cross in the snow, above the accident zone.
If possible, have another skier stand beside the skis to indicate that help is in progress, especially in areas with poor visibility.