That previous "dragging" incident is one where he followed the same modus operandi as this one... He lunged at a car, already moving away from him, and attacked the driver.
In the process he broke the window of the moving car and stuck his arm through it. To grab the driver. Of the moving car.
That "dragging" was entirely by his choice and he was the aggressor throughout the encounter. His "dragging" injuries were minor cuts, from the window glass he broke in order to attack the driver.