CCTV captured a 14-year-old pupil fighting her teachers just moments before stabbing two of them and another girl at a school in Wales.
The girl, who cannot be named for legal reasons, attacked three people at Ysgol Dyffryn Aman, also known as Amman Valley School, in Ammanford, Carmarthenshire in April.
The video showing the girl stabbing teachers Fiona Elias and Liz Hopkin, and another girl, was played to the jury at Swansea Crown Court on Friday (4 October).
It shows her trying to attack Ms Elias on April 24 while Ms Hopkin attempted to restrain her before she gets struck in the neck.
She could be seen moving on to stab another pupil before she was restrained by staff.
The girl previously admitted wounding with intent and possession of a bladed article on school premises, but denies attempted murder.
The trial continues.