I was entering an intersection, the car to my left was trning right into the street I was on so I entered the intersection. Another car swung around the turning car and took off the fron foot or so of my car. I (or the car) stopped just at impact. The other car was probably speeding (he traveled 208 feet after impact). No one was hurt at all. My question revolves around Sentry Mode. It was on & operating but stopped recording before (or at) the time of impact. I have nothing recorded. I downloaded everything from the thumb drive and it stopped recording just as I stopped at the intersection. Did I do something wrong? I didn't think to blow the horn to record something.