If he was going to pick one to grossly misuse, i can see why he picked that particular one. It continues to be my least favorite reflection of Epicurus' intensity, which is probably the same reason that it is so favored in some quarters.
I don't see how the writer came up with that choice at all, unless he was looking for something portraying whimsical detachment from reality, combined with a touch of sadness that I think results from the damage to the eyebrow and the lack of paint that was probably in the eyes that would have prevented current blankness