Super Rugby's harder line on dangerous tackles hit home on the first full round of the new competition with five players shown yellow cards and one a red card.
The departure of the half dozen, including replacement Blues loose forward Antonio Kiri Kiri, had a massive effect on three matches, with Blues defence coach Alistair Rogers going as far as to say players are going to have to be re-educated on their tackling techniques.
The Blues let in two converted tries against the Highlanders in Dunedin on Friday once Kiri Kiri was shown a yellow card for his high tackle on Lima Sopoaga. The incident came just over 10 minutes in the second half when the Blues had a 24-17 lead and was clearly a turning point in the visitors' 41-34 defeat.
In Christchurch, two players were yellow carded for high tackles in the Crusaders' 45-23 victory over the Chiefs; the second, Lachlan Boshier, giving away a penalty try in the final 10 minutes with a high tackle on Ryan Crotty as the Crusaders' midfielder was in the act of scoring.
Scott Higginbotham's Reds bore the brunt of the other big decision at the hands of the officials when the loose forward and skipper was shown a red card on nine minutes after his shoulder connected with the head of an opponent. The Brad Thorn-coached Reds lost the match against the Rebels 45-19.