At about 48 seconds in, you can see the slope that released and killed a boarder. Just because the slope still has trees on it does not make it safe.
http://usnews.msnbc.msn.com/_news/2012/01/29/10263387-avalanche-kills-snowboarder-in-half-mile-slide
http://usnews.msnbc.msn.com/_news/2012/01/29/10263387-avalanche-kills-snowboarder-in-half-mile-slide