Probably working up the guts to pull you over and ask for driving and/or shooting lessons.
Well, we can be generous and assume the latter action, the lights and speed-off, were due to something he heard on the radio.The former was probably either a habit applied in the wrong place or else harassment. "Hey, I can make you sweat bullets, you little civvie."45MPH? Ouch.
Just to clarify, the lights went off and stayed off after I was out of the way.