Corrected entry: If the shooter was parallel to the victims, on the bridge, then the police would have known where the shots had come from. Especially the water-bottle shot. If the shots had come from a 90-degree angle (as compared to shots from the parking garage) they would have definitely known it.
Phixius
2nd Mar 2014
Correction: They did know where the shots had come from. The reveal was not that they came from a different location than supposed, but that the man framed knew better than to shoot from the location the shooting came from, thus helping to prove his innocence.
Phixius ★