Tamerlan and Dzhokhar Tsarnaev were a couple of nice looking young blokes of 27 and 20 who looked like those you see walking down Victoria Ave any day of the week and to whom you could smile and say "Hello" and they may have smiled shyly back.
The biggest problem you would think they faced would be the decision whether to play rugby or soccer this year, or whether Sally's mum would let them take her to the pictures.
But they had never been to New Zealand - being born in Kyrgyzstan of Chechen parents, their family sought political asylum in the United States.
The family was Muslim, committed but not in any sense radical. Then when the boys heard about the wars in Iraq and Afghanistan from TV, and saw lectures on the internet by the radical Muslim cleric Anwar al-Awlaki, they became offended, and then "radicalised".
Again they returned to the internet and on the website of an al-Qaeda affiliate learned how to make a bomb out of various chemicals and a detonator placed into a pressure cooker. They also put in lots of nails, bolts and ball-bearings, so when they exploded it at the Boston Marathon, it killed three people, and caused terrible injuries to people's legs.