You can also slide sideways down the slope. One way you don't want to lose elevation is on foot. On a steep slope you'll just slide straight down with no way to stop. It can be very dangerous. A skier or boarder who ends up on a black slope that is too steep for their skills still has options, but they are fewer than on intermediate terrain.
Many ski runs have emergency phones.
If you pick one up, you'll be connected to ski patrol dispatch and help will be on its way. Once you find a safe spot away from the crowd, stick your skis crossed above you in the snow as a sign for help. Wait for someone to stop and ask them to contact the patrol, guest services or lift operator. Make sure that the trail or other identifying location is given so the patrol can find you and also have the person relay any messages regarding the problem you are encountering. They most often will send a snowmobile to transport the individual or bring a toboggan for transport.