It is possible that the lead and trail are on the same side when a shot is taken.
Are we supposed to change sides back and forth as the lead official??? never been taught that one... i've seen some guys get a better view of the other side of the lane, by coming over a little to get a better view..but never should you have a lead and trail on the same side of the court in a two whistle game should you????? your supposed to always have your players boxed in from what i have always learned...that is why you have two of you out there, if the ball comes to the trail side of the post they are there to help out...but that is the main reason for the 3 man crew, to take care of those problems