Let's not bash the police quite yet. I'm guessing it was an accidental discharge. People are jumping down the throats of the cops assuming the worst. I don't think in this day and age, the police want to make any statements unless they are absolutely positive they know what happened and have a handle on things. Let's give them the day to get their act together.
An accidental discharge would make sense.........................except......................why did he have his gun drawn in the first place and obviously pointed at her? And his partner in the line of fire, no less. Hopefully, as someone else pointed out, there is an audio recording even if there isn't video.