The teaching assistant sits next to him and redirects his focus to the front of the class.
The aim is to put as many pupils as possible back on an even keel and then reintroduce them to mainstream schools.
"Children will often come to us in moments of chaos," says Bradshaw.
"If the escort comes and Kirsty gets lairy we'd have to ring 999, wouldn't we? It is a Pupil Referral Unit (PRU) – a school that accommodates the most troubled and disruptive of pupils, fulfilling local authority obligations to educate all children, including those expelled from mainstream schools.
PRUs also provide education for teenage mothers, and children with physical and mental health issues that prevent them attending mainstream school.
Emma Bradshaw is standing behind her desk, phone held to one ear, the fingers of her other hand tapping at an i Pad, while members of her staff fly in and out of the room.
Headteachers' offices aren't normally like this, but the flurry of activity is for a good reason.
"Some of these kids have had more things happen to them in the first 10 years of their lives, will have had more emotions to process, than you and I will have in a lifetime." This is a branch of the education system that most people don't know about, or perhaps would rather not think about.
And if they do think about PRUs, they probably imagine them to be the last refuge of the worst "problem kids", their task less one of education than containment, the essence of "underclass Britain". Despite their additional pressures, 24 per cent of PRUs matched The Limes in achieving an "Outstanding" rating in Ofsted's most recent round of inspections – compared with only 11 per cent of mainstream schools.
An "incident" occurred at their home that morning and social services have been called.