You will notice that the LB is not marking anyone, this is deliberate so that they can be a back up for the LH if the ball gets through. Diagram 3 is again another example of a defensive set up. You will note that a slight change in the positioning of the players occurs. The RH is not man to man marking, they are giving the attacker some breathing space. Where the attacker is in relation to the ball they are not in any danger if they cover the line to the ball and are not too far away.
All players are generally in-between the player and the goal.
If you look closely you will notice that the RB is actually level with the player. The LI is again marking space, they do not necessarily have to come back this far but being a goalkeeper I prefer this so that you have an extra person in defence. Diagram 4 highlights the set up of the defence when taking a 16yrd free hit. The LH is out wide for the quick transfer of play. The positioning of the other players allows them to have their own space to receive the ball in and move with it or pass it off.