currently the “search this topic” option works great, as you can find anyone or any known post simply inside long discussions.
meanwhile the UI and the accessibility of the search result may be much better if the “search this topic” changes to a filter:
current search result:
possible search result if it behave like a filter; after you searched “ginger”- term in this topic:
In the filter-like “search this topic” you will be able to read all the posts that fit into your search simultaneously, without the need to lots of clicks and re-search’s.