There was another dashcam video released today that shows another police car arriving at the scene. It doesn't show much, but does give perspective of where the stop was in relation to the shooting. A fairly small area, it wasn't much of a chase.
Slager calls in the foot chase at 10:35
he calls in shots fired at 12:25.
Taser taser taser is not heard on this audio. it must be early if its audible in the car. that would be the first taser deployment. the second was in the park