A teacher who restrained a girl after she stabbed two of his colleagues and a pupil said he still loses sleep a year after the incident.
Fiona Elias, Liz Hopkin and a pupil who cannot be named for legal reasons were stabbed by a teenager at Ysgol Dyffryn Aman in Ammanford, Carmarthenshire, last April.
The 14-year-old girl, who also cannot be named, was convicted of their attempted murder by a jury earlier this year and was given a 15-year sentence at Swansea Crown Court on Monday.
Former assistant head teacher Darrel Campbell described the incident as like "something out of a horror movie", and said there needed to be discussions over the safety of pupils and staff in schools across Wales.