TOKYO—The scoreboard at the Shiokaze Park beach volleyball venue said: “Challenge successful. Ball out.” That didn’t make any sense. And the Americans’ survival was riding on it. “The referee just said, ’Wait, wait, wait. We’re sorting it out,” Canada’s Heather Bansley said on Sunday after winning a twice-reversed challenge to oust Sarah Sponcil and Kelly Claes 22–24, 21–18, 15–13. “I think they’re just sort of working out some kinks,” said Bansley, a two-time Olympian who is paired with Brandie Wilkerson in Tokyo. “We trust the technology they have. At least you know the correct answer, and you work from there.” After losing the first set and falling behind 10–4 in the second, the Canadians rallied to force a tiebreaking third set, first to 15 (must win by two points). They led 12–11 when Sponcil’s serve went past them and bounced off the sand. The linesman’s ruling was that the ball …