Add the dangers of glissading:http://blog.alpineinstitute.com/2008/08/dangers-of-glissading.html
My climbing partners and I would never, never glissade off a mountain. We always walked down, with ice axe at the ready if a self-arrest was necessary. My experience from California, Scotland and European Alps.
I'd add more, but it would be rock and ice rescue technical stuff, which a SAR team would be doing if necessary.