Rugby World Cup 2015: New Zealand's Richie McCaw 'dumb'
|Rugby World Cup|
|Hosts: England Dates: 18 September-31 October|
|Coverage: Live on BBC Radio 5 live and sports extra, BBC local radio, plus live text commentary on every match on the BBC Sport website.|
|Further coverage: BBC Radio Wales, BBC Radio Cymru, BBC Radio Scotland, BBC Radio Ulster and BBC Local Radio.|
New Zealand captain Richie McCaw was called "dumb" by coach Steve Hansen for being sin-binned during his side's 26-16 World Cup win over Argentina.
McCaw was shown only the third yellow card of his 143-cap career for a trip on Juan Martin Fernandez Lobbe.
Argentina took a 10-9 lead after the resulting penalty, but the All Blacks took control after McCaw's return.
"Sometimes in the heat of the moment, you have a wee brain explosion," said Hansen after the Pool C match.
All Blacks centre Conrad Smith was also sent to the sin bin shortly after McCaw, reducing their side to 13 players for a period just before half-time.
"The two yellow cards today were pretty dumb. Rich and Conrad know they were," Hansen added.
McCaw was booed loudly by the Argentina fans in the crowd at Wembley, and admitted he had made a mistake.
"(It was) one of those things that as soon as that happens you wish you hadn't. I knew straight away. It was a reflex thing. It wasn't the right thing to do. I suffered because of it and put the team under pressure."