Steven McAllister - brother of Commonwealth champion Lee McAllister - left Daniel Clark needing a metal plate inserted in his jaw.
A jury heard how Clark exchanged insults with McAllister over a boxing match they had had when they were 13, which one-time Commonwealth Games hopeful McAllister had won by a single point.
A jury heard how Clark exchanged insults with McAllister over a boxing match they had had when they were 13, which one-time Commonwealth Games hopeful McAllister had won by a single point.
Clark, 22, said there had been banter about his rival getting the decision because his father - and coach - had been one of the points judges for the amateur boys contest. Mr Clark told Perth Sheriff Court: "I wouldn't say we were friends but we didn't have any problems when we were younger. "We were talking about boxing when we were younger and he took offence at something I said. He said something about beating me when I was younger. "I said to him 'you only beat me by one point and your dad was one of the judges,' which I think he took offence to. He punched me. Two or three times. "I fell over and was a little bit dazed. I got back up and went to see the medic. Then I went to see Beyonce."
He said he was still in pain eating a kebab two days later and discovered his jaw was broken. He needed surgery and was left with a metal plate.
Counsel David Moggach, defending, accused Mr Clark of "smarting" over a single point defeat to his client in the boxing ring seven years before T in the Park.
Mr Moggach said: "It has always grieved you that you lost to him, because you felt cheated. You have always borne a grudge because you lost that match. You felt cheated and angry. "You had had a few drinks, Dutch courage, and had a slack tongue and you had a go at him. You had lost years earlier and it was still festering away."
Mr Clark said it was McAllister who first raised the childhood bout between them and denied that he had been looking for revenge.
McAllister, 23, from Aberdeen, denied assaulting Mr Clark at T in the Park last July by punching him repeatedly on the face to his severe injury and permanent impairment, claiming he was acting in self-defence. The jury found him not guilty at the end of a two day trial on Tuesday.
The men argued at the music festival, T in the Park
