A court witness suffered a fractured skull after he was twice « body slammed » against the pavement by the man he had given evidence against.
The « appalling » attack was carried out by Michael Meredith as an act of revenge.
Meredith, 23, of Hilarys Road, Erdington, was jailed for three years after admitting inflicting grievous bodily harm.
The « unfortunate » victim was attacked in Ninevah Road, Handsworth,On October 21 last year.
Meredith told him: « I have got you now because you were a witness against me in court. »
Martin Liddiard, prosecuting, told Birmingham Crown Court: « It transpired that was true. He had given evidence on a previous occasion.
« He did what he could to ignore the defendant and get away.
« He crossed the road but was quickly followed by Meredith who pushed him against shutters and punched him repeatedly to the right side of the face.
« Meredith then positioned himself as if he was going to give him a bear hug and picked the victim up and body slammed him on to the ground. »
The defendant then picked the victim up and dragged him by his clothes before bear hugging and slamming him to the ground again.
Meredith then walked away, leaving him unconscious.
The victim was taken to hospital, where it was found he had suffered a fractured skull and bruising to the brain.
As a result he had suffered from headaches, some memory loss and had to take epilepsy tablets for seizures.
Mr Liddiard said: « The hard road surface was used as a weapon. He pounded the victim on the ground twice. »
Passing sentence, Recorder Peter Ievins told Meredith: « The assault was sustained and repeated.
« It was not premeditated. It came about as a result of a chance meeting but you were only too glad to take advantage of that chance meeting.
« The victim had done nothing more than do his public duty and people like him are entitled to the protection of the courts. »
Simon Hanns, defending, said: « It was a relatively short offence, although it was a violent one.
« He had a difficult life in his early years and he has suffered with his mental health.
« His way of resolving what he saw as a difficulty between them left something to be desired. »