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** Best of all - even if the protections were as simple as they seem, the end result is that the seeker ends up in the last room ''with no way back'', as the potion that allows them to pass through the fire guarding the final door contains barely a mouthful of potion. This essentially traps whoever is after the Stone in that room with the Mirror of Erised, which won't give it to them unless they only want to have it, but not use it. Thus, whoever came looking for the Stone would likely be trapped in that room, too distracted by trying to figure out the mirror to try and find an alternative means of escape, until Dumbledore himself turned up to deal with them.
