They stopped the final round in the men's heavyweight boxing final to tend to the Russian bloke, who's head was bleeding, for an absolute age. Must have been frustrating for the Kazakh, who seemed on the verge of knocking him out at the time.
Also watched a splendidly dirty matchup between an Egyptian and a Mexican earlier. The Egyptian was punching to the back of the head, pushing his opponent's chin up with the back of his hand and finally did a low blow smack where it hurts. The Mexican on the other hand spat his gumshield out about 6 times to delay the fight and take a breather, suspect he knew that he was ahead.