A dad headbutted a headteacher after being called to collect his daughter from school due to her unruly behaviour.
Shaun Pattyson, 27, and his partner were asked to pick up the girl from Chesterton Community Sports College due to her behavioural issues.
But while headteacher Robert Swindells was having a conversation with the child's mum the defendant approached, squared up to him and butted him.
In court, the prosecution alleged Pattyson then continued the assault by punching and kicking the victim.
The case has now been adjourned and Pattyson will learn his fate next month.
Prosecutor Emma Thompson said Swindells has worked at the school for 25 years and has been head for 10 years.
She said the school had been experiencing problems with the student for some time with issues including swearing at teachers during lessons.
The child's parents were called in on 9 May.
Thompson said: "The headteacher had a conversation with the child's mum on the phone and she said she would come immediately to collect the child.
"The child went to the front entrance and began being rude. Within 10 minutes the child's parents arrived.
"The mother approached the front entrance and shouted at the child to get a phone. The child went to collect the phone.
"The defendant appeared and squared up to the headteacher. The headteacher could not remember what he said to him but the defendant was swearing at him before head-butting him.
It connected with the right side of his face just below his right eye. He immediately fell to the floor as a result of the headbutt.
"He felt the defendant kick and punch him for approximately 10 seconds."
Afterwards, Pattyson admitted his actions to the police and later pleaded guilty to common assault
Thompson added Pattyson "believed the headteacher was a bully and that is why he assaulted him."
Representing himself, the defendant said: "I'll admit to head-butting him because I did. I admit to punching him. I did not kick him. If this is on CCTV, show it to prove I did not kick him."