it's basically bullshit
i forget which kind of decay function tends to play in but i think it's a log10
so 10% sold price is 50% something like that
the actual orderbooks can tell you where it will go, momentarily, but if it goes down they won't tell you who has stop loss orders waiting to be triggered at whatever level, only the ones that have been registered, stops are supposed to be executed by trigger they are not telegraphed