hmm ... but what will be the meaning of a single comment, on a single page, if you can't get the context because the original text / comment it belongs to is missing ?
hmmm ... so a URL in form of http://<given_url_if_topic>#commentID ... that will led to the page with the given topic and shows automatic the commend the commendID at the anchor points to ... OK, that makes sense ...
https://plus.google.com/106416716945076707395/posts/HAisuirqg6i#c4
The effect being the same if you click on the link. Bring up the post with comments expanded and the referenced comment scrolled to be visible.