Answer: By struggling with the LEO, snatching a taser from LEO, apparently discharging the taser at LEO.
Now, is it preferable to allow the suspect to incapacitate the LEO with the taser, steal his firearm, or should we expect that LEO should be shot first before returning fire?
Don't be a pinhead.
There's a little interlude in the middle where he turns his back and runs.