The article I am quoting is based on eye-witness accounts. Eye-witness accounts were part of the multiple court cases deciding on the matter.

My position includes credence to eyewitness accounts.

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The guardsmen were not "rushing" or "ambushing" the rioters. They told the rioters to disburse with a bullhorn and the rioters responded with violence. The guardsmen moved toward the mob to try and enforce the disbursement. But, the mob continued the violence, forcing the guardsmen to go back to where they started.

That is bearing down on by the rioters. That is retreating by the guardsmen.