Guards (probably) move clockwise

One idea I’ve been playing with is having a guard move clockwise round the outside of the board. The problem is that the game is too easy. Perhaps, then, one guard would be patrolling the perimeter fence, looking into the base, checking for disturbances…

I’m assuming that a guard would move clockwise. Would it be confusing if the guard could move anti-clockwise too? Or perhaps the guard could be paused or halted? Once I start asking questions, it becomes clear that the on,y way to get answers is to try out the options. All of them.