"As the group came to my attention, I heard some of what was being said", Stokes said in the written statement.
He identified Stokes to attending police officers, who arrested him.
The fight took place several hours after England had played a one-day global against West Indies at the city's County Ground.
"While I was trying to stop the fighting, one struck the other with a clenched fist and he fell to the floor", Spure said.
Jurors have been shown footage of Stokes brawling with Ali and Hale, who are friends, in the early hours of September 25 a year ago after walking away from the Bristol nightclub Mbargo.
"At this point, I felt vulnerable and frightened".
"I walked into the road to try to separate the group and get in between them", he said.
Prosecutors say Stokes was the "main aggressor" in a fight that broke out after an England match. "As I was on my own, when I separated two of them more people carried on behind me", the statement continued.
On Monday's opening day of the trial, jurors saw footage of Stokes, 27, brawling with 27-year-old Ryan Ali and Ryan Hale, 28, outside Mbargo in the early hours of September 25 last year.
"Both Kai and William thanked me for preventing them from being beaten up". "He had a green t-shirt on".
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Mr. Spure added that Mr. Ali "seemed to be trying to back away or get away from the situation" before Mr. Stokes punched him.
"He had a conversation with his friend and he said "300 get us in" and I still told them no".
Cunningham said two gay men he knew, William O'Connor and Kai Barry, then emerged from the nightclub and began talking to each other.
Cunningham said he did not step in until Stokes flicked a cigarette butt at the men.
Stokes told police he "did not feel in any way drunk or impaired" and that he had consumed two or three pints at dinner before a further five drinks of vodka with a mixer in the Mbargo nightclub.
One suffered a fractured eye socket and the other was unconscious.
Hale cycled to hospital, where he was found to have bruising and a 1.5in superficial laceration to his forehead consistent with blunt trauma.
Trial judge Judge Peter Blair QC earlier asked 16 potential jurors whether they were "extremely committed" cricket fans following either the England or India teams.
Stokes, of Durham, Ali and Hale, both of Bristol, deny affray.