Topic url question

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I was wandering around the new 'topics' feature and noticed how the URL of topics is formed:
http://127.0.0.1/concrete5/index.php/services/topic/62/cat-1...
I would appreciate if someone sheds some light on these question:
1- How is it that C5 treat /topic/ part of URL as a query string and not a page under services page?
2- What if there was a page slugged 'topic' there? Is the word 'topic' is kind of reserved in the core for this purpose?
3- If C5 treat this like some kind of exception, where is it housed in the core? And how can I change it to maybe another sting?