There are lines that are drawn deep in the sand. So deep to the point where they can't be erased and no one can cross it. But sometimes the lines just aren't deep enough. People can still cross over and brush away the lines. However there is always this one person that, no matter what walls you try to hide behind or the motes you try to build in the sand, they will always be able to get across and storm the castle gates. There is no escaping from them when they want to get to you.
