Check out this avalanche triggered by a snowboarder in Ischgl, Austria. There are a lot of tracks pretty close to the avalanche already, but that's no guarantee that it's safe. The terrain above is pretty steep (you see the rocks coming through) and that part of the slope looks a bit steeper than the part where there already are some tracks. Anyway, the guy is lucky not to be buried by the avalanche. Also because it doesn't look like the other riders on the slope are prepared to perform an avalanche rescue.