About seven minutes into the women’s 10-kilometer freestyle mass start on Sunday at the World Cup in Seefeld, Austria, Jessie Diggins made her intentions clear. She wasn’t in it for a free ride — she was willing to pull, and not just take her turn up front, but actually try to string out the field and win this thing. As she led a group of 31 within 15 seconds of her at 3.3 k, Diggins,...