LAHTI, Finland — Electric. With every jumbotron shot of Finland’s Krista Parmakoski or a glimpse of her powerful compact-frame as she lapped through the stadium, the hometown Finns were electric. White and blue flags waved. Like anywhere in the world when a brilliant athletic performance unfolds in the home country, the roars for Parmakoski were deafening. From the start, she emitted a big dose of hope for fans in Lahti during Saturday’s 15-kilometer skiathlon at the...