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A woman who videotaped a San Francisco Bay area transit officer killing an unarmed man has testified that the officer didn’t act overly aggressive before the shooting and appeared “dumbfounded” afterward.

Karina Vargas was one of several witnesses who recorded the New Year’s Day shooting.

She told the judge Monday at the preliminary hearing for Johannes Mehserle that she believed other officers were unnecessarily aggressive in detaining Oscar Grant, whom she said didn’t appear to be resisting arrest.

Videos show Mehserle firing a shot into Grant’s back as the man lay face down on a platform. He was being detained for allegedly fighting on a train.

Mehserle has pleaded not guilty to murder. His attorney has said the officer meant to reach for his stun gun.