I remember reading from somewhere the camera will flash twice,
simultaneously. If it flash once, that means the second shot is not
taken, i.e. you should be ok.
If you see a second shot, it usually means you have cross the
pedestrian line. Then if the second shot shows that your car did
not cross the zone, then TP will not call you. Technology still has
it limitation, and TP will still need to see photo proof.