It took the intervention of the penultimate barrier in the 100m hurdles final to deny Lolo Jones Olympic gold in Beijing 17 months ago. In the Kelvin Hall arena yesterday it was Jessica Ennis – just 5ft 4in in height but fast becoming a giant in stature in the track and field world – that sent the great American hurdler crashing to earth. On this occasion, in the Aviva International, the traditional curtain- raiser to the top-level indoor season, the fall was metaphorical, but it was a mighty one nonetheless.