Without hearing the audio, I can already see a couple of things you didn't do, so I can see why they wanted to suspend you as it would apply if you worked at another law enforcement agency. You weren't wearing a reflective vest, you weren't using a traffic wand or cone on your flashlight, and you weren't using a whistle. Most importantly, the agency never has trained anyone to throw their flashlight, that's a CYA on the agency's part. I can see that you were trying to get the driver's attention in order to avoid getting hit or to prevent a t-bone accident.
I don't know how it turned out, but hopefully it didn't burn you too much. Stay safe.