There are days skiing here in Bend, Ore. when the privilege of sliding on groomed trails becomes ho-hum. Maybe you’re not feeling the energy buzz. Maybe the technique is breaking down. First world problems. But we stress about them anyhow. Those are the days when it’s a sight to see Bernie Nelson gliding along. She gobbles up the meters as she presents a holy grail of vertically stacked imagery. Hip, knee, and ankle perfectly aligned....