De Bruijn was in front of Henry when they reached the halfway mark .
The 20 - year - old Australian spun around and shot past De Bruijn on the last lap to finish with three gold medals of De Bruijn 's own .
De Bruijn was in front of Henry when they reached the halfway mark but the 20 - year - old Australian spun around and shot past her on the last lap to finish with three gold medals of her own .