I feel that this is something that was never really covered in the games, and that it might make an interesting question!! :)
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Wouldn't that be like walking off the edge of the world? Guessing you would have mag boots, or the ring has gravity - well something is keeping you attached ... and that force is strong enough to resist the force you excert when walking. ([i]ie the force of taking a step doesnt send you flying off[/i]) So kinda guess you would step off the top surface and onto the side ... like walking off the [i]edge of the world[/i]. Be a great game addition, games like Assassins Creed have a lot of these pointless but fun tasks built into the game ... gives an extra dimension to the game.