Eisen sat the shoes to the side and started thinking about how to best create the other effects. The boots were able to create a small barrier to stand on at any possible angle, but of course you wouldn't be able to stand on a barrier created in front of you vertically just like that.
That meant that Eisen had to make something else that would apply a new gravitational force on the body depending on the placement of the barriers. Getting that angle information wouldn't really be such an issue, it was just that Eisen had to find a proper way to make the gravity affect anything and everything on Stahl's body. After all, the 'awesome' effect would be gone if Stahl stood somewhere upside down and his top-hat just fell to the ground.
And then, the old man had an idea. All that Eisen really needed was an item that could grab Stahl's form, and then apply gravity magic to just exactly that area.
