Well I know that's what he's doing I am just commenting on what the look he gives would represent were we to see it in everyday life. Whatever it is supposed to mean, that is what the look is that he gives. It could be he is trying to tell Anakin he made him. It could be Ian McDiarmid make an acting blunder, it could have been Lucas made a directin blunder, whatever.
I think Lucas meant to leave that question unanswered, kind of like the Yoda origins question.