Magic circles have a variety of shapes.
A doughnut-shaped magic circle; it's possible there's that sort of type as well.
A trap teleport magic circle concentrically outside the correct answer teleport magic circle.
I wonder if there isn't that sort of possibility, as well.
In other words, it's not the exterior; if you jump onto the innermost circle, arrival on the next floor is possible.
…That's stupid. From what places Ikkyu-san is this. [6]