In the “pole in the barn” example done in lecture, how can Bob observe/photograph the front of the pole to be located at the rear door of the barn at 44.4 nanoseconds and the rear of the pole to be located at the front door of the barn at 44.4 nanoseconds (so the entire pole is in the barn), while Alice agrees with Bob’s clock readings but never herself observes the pole to be entirely within the barn?