Hate to rag on boarders, but they do something when they are in a fast sliding fall. The try to hold the board up above the snow so they don't catch an edge. The board is then between knee and thigh high. A friend of mind was hit in the knee by an elevated board (edge) and took a long row of stitches to sew it back up.
What are you talking about? Snowboarders levitate?
I snowboarded for 6 years. You have 3 options-PTex flat against the snow, heel side edge and toe side edge. You can stop with a heelside hockey stop or a toe side hockey stop or by sitting flat on your ass like I did when two out of control groms called out for me "not to turn". If you are wiping out, your board has a habit of getting over your ass in elevation, but it's certainly not a planned manuever. Snowboards are controllable only when you are on the edge and you scrub off excess speed by applying heelside or toeside pressure to the edge on the board