Robbie Deans opens up about the devastating impact of the Christchurch shooting ...

Rugby great Robbie Deans believes the massacre of 50 defenceless men, women and children in Christchurch has changed New Zealand permanently.

The Kiwi coaching legend struggled for words when he described the senseless loss of life and damage done to the shattered city where he played and guided teams for decades.

'I'm in shock...' Deans said. 'That's the only way you can describe it.'

Rugby great Robbie Deans (pictured) believes the massacre of 50 defenceless men, women and children in Christchurch has changed New Zealand permanently

Rugby great Robbie Deans (pictured) believes the massacre of 50 defenceless men, women and children in Christchurch has changed New Zealand permanently

The Kiwi coaching legend struggled for words when he described the senseless loss of life and damage done to the shattered city. Pictured: Youngsters perform a haka during a students vigil near Al Noor mosque

The Kiwi coaching legend struggled for words when he described the senseless loss of life and damage done to the shattered city. Pictured: Youngsters perform a haka during a students vigil near Al Noor mosque

Deans was born and grew up in Canterbury, the South Island area where Christchurch is the biggest city and regional seat. Pictured: A Muslim worshipper prays at a makeshift memorial at the Al Noor Mosque

Deans was born and grew up in Canterbury, the South Island area where Christchurch is the biggest city and regional seat. Pictured: A Muslim worshipper prays at a makeshift memorial at the Al Noor Mosque

Deans was born and grew up in Canterbury, the South Island area where Christchurch is the biggest city and regional seat.

He finished high school at Christ's College in Christchurch, attended Lincoln University about 15km outside the city and while he now coaches in Japan still calls Canterbury home.

Deans was in Amberley, about 45km north of Christchurch, last Friday when he learnt a gunman had opened fire on scores of Muslims in two mosques during their prayers.

'You just never thought that it could happen in our community,' he said. 'As he indicated himself, he chose the destination for that reason.'

'It will have changed not only Canterbury but New Zealand forever. Particularly for the next generation of kids because the things that you take for granted or took for granted are no longer a given. And that's very tough for young kids to comprehend.

'That's the worst thing - it's shattered an innocence, if you like, within the community. It's irrational. Which makes it all the more difficult to deal with.

'It will change the place forever. It will change the community, it will change attitudes. But it will also harden the resolve.

'The community will come through it. They'll support each other. But it will leave a mark, it will leave a scar. And for those that were affected...'

Deans could not finish that sentence. 'It's beyond comprehension.' he said.

The 59-year-old, who was in charge of the Wallabies from 2008 to 2013, coached the Christchurch-based Crusaders for eight seasons, winning more Super rugby titles (three in Super 12 and two in Super 14) than any other leader.

Before that he coached Canterbury, also based in Christchurch, to the National Provincial Championship in 1997.

The five-Test All Black, who was an assistant coach of the national team, also played 146 games for Canterbury between 1979 and 1990.

Deans was in Amberley, about 45km north of Christchurch, last Friday when he learnt a gunman had opened fire on scores of Muslims in two mosques during their prayers. Pictured: Victims of the shootings

Deans was in Amberley, about 45km north of Christchurch, last Friday when he learnt a gunman had opened fire on scores of Muslims in two mosques during their prayers. Pictured: Victims of the shootings

'It's a great community Canterbury, as is New Zealand,' Deans said. 'But

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