An 18-year-old man was charged with assault in central Christchurch on Friday night.
Police attended the Saint Asaph St incident around 9:15 pm and took one person into custody, a police spokesman said.
The spokesperson said the man was charged with assault with intent to injure on Saturday. The victim suffered minor injuries and required hospital treatment.
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Hato Hone St John arrived at the scene before 9 p.m. on Friday to treat the victim and transport him to hospital, a spokesman said.
The attacker is due to appear before Christchurch District Court on Thursday, April 6.