[Jeff Stout]

Yes the pre stage and stage beams will go off when the tree has been activated and something happens such as leaving and going green or leaving and going red. Then when tower resets system for next pair of cars and your car was on starting line it registered that the next car was up to line ready to go with both beams lit. I think in Mike Rice comments it explained that portion of the lights going off and back on.
I didnt give it any thought about the time it takes for filament to stop illuminating like Bret describes but math wise it would make sense that we didnt see it on film or it was that fast on then off then on again that the filament never stopped being lit.. I know this sounds like a reach but to me its the only way I could see it happening with reason.
When checking roll out at Speedworld I was able to rock our test wheel and get light to flicker or be solid lit or off. It took time to do it but I was wanting to get accurate reading to make lanes equal. Also Sunday team race in time trials I had a car run faster ET then it ever had and a 524 MPH time slip. One of two reasons a piece of paper or the large wind gusts and dirt devils we had shook the foam reflector in center of track making the sensor think something stopped the reflection after he crossed 1/4 MPH start clock but before he crossed MPH finish. I know it has nothing to do with problem at hand but a explanation of reason why it happened. Never had problem before and the next 6 hours of racing that day.
Jeff