> Here's the blog:
> <http://alabelforartists.blogspot.com/>
I asked for the url of the blog AND the url of the comment, don't bother
answering my question fully.

> I've tried searching the first blog for strings
> within the comments 
Why, Httrack certaintly does look at the content other than links.

From another posting, comments are
<https://www.blogger.com/comment.g?blogID=XXX&postID=YYY&isPopup=true>
which is external to your starting url.
Add a filter +*/comment*