(a) by reason only that the proxy has acted in good faith in accordance with the provisions of this Act; or

(b) for failing to make a decision on behalf of the maker.

(a) has acted in good faith in accordance with a decision expressed in a health care directive or in accordance with a decision made by a proxy, or

(b) has acted contrary to a decision expressed in a health care directive if he or she did not know of the existence of the directive or its contents.