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A teenage student punched a maths teacher in the face after he was told off for interrupting a lesson.
Seemingly annoyed he had been chastised in front of his peers, the 13-year-old hung around in the corridor as lessons ended.
When maths teacher Guillermo Badilla walked out of his classroom he was pounced upon.
The boy can be seen in mobile phone footage running up to the teacher and forcefully hitting him in the head.
Mr Badilla stumbles into a wall as the aggressor moves away and the teacher shouts after him.