The actual 'moment' I suppose was the face-off before the fight, because you just knew nobody could be as confidence as Eubank was appearing without KNOWING he was going to do as he said and make Benn look silly and cane him (because he wouldn't be able to live with the embarassment otherwise, surely?), while Benn - the most exciting fighter and hardest puncher ever - was really giving off a calm-before-the-storm thing and you could just tell that he really did really, really, really want to hurt this guy

It was something intangible before the bell had rang

Another 'moment', perhaps more of a confirmation, was just after the bell rang to end the second round