This account is consistent with ones that were going around the MC grapevine right after the incident. The only thing new to me is that it was a woman the got her foot run over. Clubs have said for over a year that the Cassocks were infiltrated by the Cops. Interesting that they took the most deaths. The presence of many of them is most likely the reason. Especially if they had sprung an ambush.
No honor among thieves. If the cops had joined the Cossacks, and started or provoked the altercation, those points do not rule out the cops targeting Cossacks, and may even tend to rule it in, as those Cossack individuals were known to the shooters.