If all three officials are mainly involved in monitoring their areas of responsibility (in this instance both the lead and center should be looking towards the paint for potential rebounding position fouls), then your "guess" would be by far the best. Now, admittedly, if the Center had perceived correctly that you had been straight-lined, or if the Lead was slow getting back to the baseline and was aware of your being straight-lined, then they may take note of the shooter's feet in relation to the 3-pt line. But it would be their responsibility to stop the action and after conferring with you, correcting the call. There is absolutely no fault with your action, as described, imo.
