If it's Vaian's perception that counts, then yes. It could be the sword's rather than Link's, for instance, what with the sword probably being sentient.
But in your example, if it's the wielder's perception who matters, then yes. The sword would never allow an evil person to touch it, though, so it more likely relies on the sword. (Who seems to agree with Link on the definition of evil so it doesn't make much difference @_@ but it's an odd detail.)
Originally posted by Q'Anilia
Sounds like some easily hyped scenarios. What happened there?
Break - In WW Link approaches Ganon's Barrier that covers all of hyrule deep in the ocean and cuts it open, shattering the barrier with the MS
Open/Close - in TP Link plunges the sword into the pedestal of time and it opens a up doors to the sacred realm(parallel dimension to Hyrule) where the temple of light is. stabbing the blade into it again seals the door
Also in OoT removing the sword from the pedestal of time opens the way to the sacred realm. Replacing it seals the way
Dispel - in ALttP Link uses the MS to dispel the barrier blocking the way to Agahnim(sp?)
Power Seal - in WW when you remove the Master Sword you quickly come to learn that the sword was the only thing that had sealed Ganon's power for centuries and now he could unleash his power against the world.
At the end of the game you seal his face with the sword... lulz
that's all I can think of now but I think there's some other stuff with the Twilight Realm or something...
When Link is permanently transformed into a wolf by Zant (by shoving a crystal into his skull), the Master Sword is able to transform him back, and remove the crystal.
Ganondorf, Phantom Ganon, Aganhim, Puppet Zelda, etc. usually attack by throwing balls of energy, and Link must reflect them with the Master Sword. This is so common that is actually has a name, "Dead Man's Volley."
It also fluctuates wildly in power. It can be upgraded, like when it is tempered, infused with Great Fairy magic, or absorbs the Twili Sols. It also decreases, such as when Ganondorf kills the Sage's praying for its power or in the Oracle games where it lost power.
It did break the barrier around Hyrule Castle, seal the majority of Ganondorf's power and freeze Hyrule Castle in time, etc. too, like Cyner said.
Those sound to me like very unique scenarios and not something that can be used to claim the Master Sword as protector against all evil. The talk about the seal and about the Sacred Realm make me look at it more like a key than an anti-evil weapon.
Warcraft characters break barriers all the time. The fact that Link has broken some, does not make his weapon all that ultimate. From what I have seen, Ganondorf is inferior top-class Warcraft magicians.
Bottom line: How do you know you are not listing its duties, rather than its functions?
Originally posted by MooCowofJustice
He won't be. You know, being protected from evil magic and all that.
Yes, we know. His No-Limit function that protect him from all magic by all his enemies, who by fighting him are by definition evil.