The darts are fired once but pulling the trigger can give multiple jolts. The Tasers the PD and the SO carry here carry two cartridges, one in the fire position and one in the grip. If the wires come in contact with skin they can also deliver a jolt.
It’s an X26 Taser. Everyone knows by now, exactly how it operates. It was no threat to Slager.
Slager dodges the Taser. He knows it’s behind him.
All of this will be public testimony, unless Slager makes a plea deal, which he just about has to.