The teenager who seriously injured "Good Samaritan" Lucy Knight during a violent bag snatch committed a similar robbery only five days earlier.

Hendrix Hauwai, 17, was due to be sentenced yesterday on two counts of assault with intent to rob and causing grievous bodily harm to facilitate his flight from the scene after the incident outside a North Shore supermarket on September 23.

But the hearing was adjourned because of extra charges of robbery and assault with intent to injure coming from Manukau District Court.

Hauwai had no assigned legal counsel on those counts but that was remedied later yesterday afternoon at North Shore District Court.

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Defence counsel Kelly-Ann Stoikoff went through the police allegations with her client and gave guilty pleas on his behalf.

It can now be revealed, the robbery charge happened just five days before the incident which saw Ms Knight hospitalised.

According to court documents Hauwai robbed Ai Qiu Luo in East Tamaki.

He took the victim's Louis Vuitton bag, iPhone, $1000 cash, driving licence and banks cards.

Judge Ajit Singh set all matters down for sentencing in February.

Ms Knight, 43, underwent surgery to relieve bleeding on her brain after she tried to stop Hauwai stealing a handbag from Xiao Dong outside Countdown in Northcote.

Believing the sentencing would go ahead, she tweeted yesterday, saying: "Feeling overwhelmed and stressed today. #23SeptReminders".

The mother of six fell and fractured her skull in the incident, which happened in front of her young children.

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A Givealittle page set up by friends raised nearly $270,000 for Ms Knight's family.
Hauwai indicated he wanted participate in a restorative justice conference but that was declined by the victims.

Ms Knight was one of the 10 Herald New Zealander of the Year nominees.