When asked about separating Stokes and Ali, Spure told the court: "The individual seemed to be the main aggressor or was progressing forward trying to get to another individual".
Jurors have seen footage of Stokes talking to O'Connor and Barry outside the Bristol nightclub Mbargo in the early hours of September 25 past year.
Previously, a jury heard that the England all-rounder had knocked unconscious Ryan Hale, 27, and Ryan Ali, 28, during an alleged altercation in the early hours of Monday 25 September 2018.
Mr O'Connor and Mr Barry walked off with two club-goers, Ryan Ali and Ryan Hale.
Further CCTV footage showed Stokes approaching a retreating Ali, Adams said, adding: "From this point it is very hard to identify who is involved".
Det Con Daniel Adams, the officer in the case, told the court Mr Hale "returns with what appears to be a metal pole with a t-bar on it".
He said Ali "seemed to be trying to back away or get away from the situation" before he was punched by Stokes.
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PC Stacey Alway, who arrested Stokes, told the court: "From the moment I approached him (Stokes) he calmed down and was compliant".
The jury heard he then identified Mr Stokes to police officers, who arrested the cricketer. Stokes said "matters had become too serious to ignore and that I had to intervene".
"I chose to intervene and asked Ryan Ali and Ryan Hale to stop abusing Kai and William". "Although I can't remember anything specific now, I do recall that the language being used was homophobic in nature and was being directed at Kai and William by Ryan Hale and Ryan Ali". I took exception and said "leave it out" and "you shouldn't be taking the piss because they're gay". He mentioned my gold teeth and he said I looked like a c... and I replied, "Thank you very much".
Stokes told police: "I can hear on the video Alex shouting". He said the pair "scuffled" on the floor, before Hale grabbed him from behind.
He 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.
"Neither of us had met the two guys who attacked us with bottles prior to this point - although I had of course seen them briefly. I was concerned for myself and others", he claimed.