Lets say you RuneScape gold encounter one of your targets, as there are lots of hiding spots all over the thieving region you may see a hollow tree and click on"hide in shrub" and if you do click on that option you will hop in the tree and your own icon in the map will evaporate. Ok since your goal is in website you seem on the map to see exactly where he is (you aim shows up as a purple dot on your map). Now along with your target list and item viewer on your own thieving pub on your principal list of options (inv. Q points and such) there's a meter which shows you if your goal is in range of you or not.
Now lets say you're a level 10 thieving and your target was still a few paces away. Since you are such a low level your only option is to get very close to him (an din doing so, allowing him see you) and try to pickpocket him. Now lets say you are a level 80 thieving. As you are such a top level burglar, you have much more choices of how you are going to sneak out of your target.
Lets say you select a way were you have a hawk ( The hawk are a new summoning familiar especially constructed for this particular game) familiar and you send it out toward your goal to try and steal the thing that he is carrying in his inventory. Additionally, because the method of thieving you are using involves not one, but another creature to try to steal the item from the competitors inventory, you can rune from sight of your target so that he doesn't know that your hawk buy School RuneScape Gold familiar is about to take his item and bring it back to you.