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I guess, the premise of this behavior is that you assign an image to a topic.
In an article, you decide, if you want to show the topic image, or not.
You have also an option to replace the "topic image" with your own image.
But because it is still a "topic image", when you click on it, it opens the Topic.
If you want to change the behavior, it seems like you would need to rewrite the
function imglink() in class.newsstory.php
And also change the function nw_seo_UrlGenerator in functions.php, specifically the line:
return NW_MODULE_URL . "/index.php?topic_id=${id}";
to something like:
return NW_MODULE_URL . "/article.php?storyid=${id}";
where the "id" is the ID of the article, which you will be sending from the function imglink() when you call nw_seo_UrlGenerator.