This exploit is widely known as "Roblox ff and btools". This will grant you the ability to gain a forcefield around the player of your choice. Just type in their username and you can activate or deactivate their forcefield. If you put "btools" and then a name, you get some building tools. They are all called "Hopper Bin" but do not worry, they still work. The first tool moves blocks. The second one copies blocks. The third one deletes blocks. Sadly, this will not work on ALL blocks. You can even delete weapons out of players hands.