>>150977754
In my mind, it's more magical, in that the sword simply doesn't cut the person who's supposed to pull it out but cleanly slices through everything else. It discourages people from even trying unless they're very deluded.
I suppose you could try to cheese it by pulling it with your thumb and forefinger and avoiding the edge, but if it's magic, you could say that it burns your fingers as punishment for trying to be 'clever' instead.

Also, that picture is borderline canon, if I remember LtoP correctly.