"We usually have our assembly in period four but we brought it forward to period two mainly to ask the boys not to text and use social media to talk about what happened and speculate about why. It would be totally disrespectful to [the student], his family and his friends."
After the special assembly, the day continued in a normal fashion, Mr Kirk said.
A health and safety report was being completed by senior staff. An incident like this had never occurred in the 15 years Mr Kirk had been headmaster at the school.
An assistant principal had been in touch with the student's parents who were in hospital with him yesterday, and Mr Kirk intended to be in touch with them personally later in the day. He hoped the student would be back at school once he had recovered.
ACC figures show Northland claims were made for 2648 students for injuries at school in the last calendar year, up from 2591 in 2012.