A snow saw is useful for building snow shelters and for avalanche danger testing. Some models are said to be easily attached to ski/trek poles in order to increase the handle length. Under what circumstances would I wish to extend the handle length of a snow saw? I read at [a forum](http://www.timefortuckerman.com/forums/forum/lunch-rocks/general-discussion-tux/16044-choosing-a-snow-saw) that an extension would allow cutting a cornice but don't understand when it would be wise to do so. Maybe you know why a cornice should be cut or you know of another use for a saw could do with a much longer handle.