okay so my google-fu is failing. What is deadfalling? Is it the same as getting caught in a tree well?
deadfall are trees that are dead and have fallen to the ground.
...and as it relates to what the patrol said about riding where these guys were, I presume "deadfall's" refers to submarining the nose of your snowboard under a fallen log while the rest of you goes "Over?" Essentially,.. cutting you off at the knees??