arragement of played cards

Hi all!
L42B2:  Dummy “may try to prevent any irregularity”.
L43A1(b):  “Dummy may not call attention to an irregularity during play”.
But L65B3: “A player may draw attention to a card pointed incorrectly"

During the play Dummy asked his partner to correct direction of his card
from last trick that has already pointed incorrectly
Several questions:
-       is dummy a player under condition of L65B3 or just a mechanical-man?
-       dummy “may try to prevent” only but such a situation is correction
AFTER irregularity and violates L43A1(b)

It seems to me that wording of L65B3 creates possibility to awaken partner
and to correct his mistake in calculation of tricks – which could affect his
future play… Of course, it concern defenders also…
Where am I wrong?
Best regards,
Vitold

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