The National Lawyers Guild responded to the crash by saying the sheriff's department is being "dishonest and misleading" by saying the auto was moving slowly.
"He just broke the window, running south, running to the south", says a deputy in the helicopter.
The latest protest was organized by the ANSWER coalition, which stands for Act Now to Stop War and End Racism.
"The collision occurred while the patrol vehicle was traveling at slow speeds", said spokesman Sgt. Shaun Hampton.
A POLICE auto ploughed into a 61-year-old grandmother at a vigil for Stephon Clark, an unarmed black man killed in a police shooting. They have urged the firing of the two officers involved, who have been put on administrative leave.
The demonstration drew between 200 and 300 people to a downtown park.
Dozens of protesters of a Sacramento police shooting of an unarmed black man have gathered for a rally, including the man's fiancee and young children.
Police released footage of Clark's shooting 72 hours after it happened.
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Clark's fiancee is on stage and expected to speak.
"I love Sacramento and this community will always be a part of me", said Matt Barnes, whose basketball career included playing with the Sacramento Kings. However, protests became particularly tense after the autopsy results were released on Friday, which concluded that Clark was shot eight times, mostly in the back, clearly refuting the contention by police that Clark was moving toward them when they gunned him down.
Capital Public Radio reports protesters had a brief confrontation with police outside the hotel. The vehicle that struck the protester continued driving.
#Black Lives Matter activists have arranged two protests at Golden 1 Center in Sacramento since Clark's passing. Protesters and officers also had a brief standoff near a highway ramp, before protesters changed direction.
On the night of 18 March, Clark, a 22-year-old father of two, was standing in his grandmother's back yard holding only his iPhone when officers, who did not announce they were police, shouted at him to reveal his hands then fired before he could respond.
A sheriff's auto struck and injured a protester attending a Saturday night vigil for Stephon Clark, the man shot by police March 18 in his grandmother's backyard in Sacramento, Calif. "Dr. Omalu's findings and the family autopsy, it suggests all the bullets were from behind".
Clark's death was the most recent in a string of fatal shootings of black men by police that have triggered protests across the United States and fueled a national debate about bias in the American criminal justice system.
Sacramento County Sheriff Scott Jones blamed "paid protesters" for causing the chaos during the rally.