Heather Mills-McCartney's personal trainer has been describing how he witnessed an alleged assault on her by a paparazzi photographer.
Lady McCartney has previously given evidence at the trial
Benjamin Amigoni said he was riding into a Brighton subway to meet Lady McCartney on his bike when she phoned him and said: "He's here, he's here."
He said Jay Kaycappa, 32, of Fareham, Hants, then "moved in behind her, hand on the shoulder, and moved her around".
Mr Kaycappa denies assaulting Lady McCartney on 5 July last year.
The estranged wife of ex-Beatle Sir Paul McCartney had been on a bike ride along Brighton seafront with Mr Amigoni, 23, and another male American friend.
Her trainer told Brighton Magistrates' Court on Tuesday that he had seen "a gentleman hovering around photographing" her prior to the incident in the subway.
Following the alleged assault, Mr Amigoni said Mr Kaycappa was "behind me, I was swerving left to right to block his way".
"I remember him saying, 'All this for an effing photo, I've never run so much in my life'.
"I said to him, 'You've got your photo, are you going to leave'."
But defence lawyer Anya Lewis suggested in court that he had not seen Lady McCartney "being touched in any way", because his testimony about her right shoulder being grabbed differed from a police statement following the incident when he said it was her left shoulder.
Mr Amigoni replied he was "100% sure" of his account.
"I saw that when I came in [the subway], I remember, there's certain things that you remember," he said.
As part of police evidence given in court, the magistrates heard that Mr Kaycappa would not sign two differently-worded police statements he gave.
One said, "So I spun her around, I must have spun the bike around as well", and the other, "I wish to clarify, what I actually said was I would find it hard to spin her around when she was on the bike".
During interview, Mr Kaycappa claimed Lady McCartney threw water at another photographer in the subway and shouted: "The scum are here, the scum are here."
She has previously told the court she suffered a damaged vertebra in the alleged assault.
Mr Kaycappa, a freelance photographer, also denies assaulting her American friend Mark Payne on 6 July.