I got pretty badly hurt by a person who did not understand an "on your left". I was on my snowboard, riding down a short trail between a bus stop and Blackcomb mountain. (next to Whistler) So there is this skier, walking down the trail with skis on shoulder. He hears my "on your left" and looks to his right, which swung the back of the skis right into my face. I snap my head back, like a ninja, thus saving my nose and teeth, but leading to the board's back edge to grab hard. Cont'd..