The purpose of a topic sentence is to introduce the main point(s) and provide a clear comprehension for the reader. In this writing, the thesis sentence given is: Everyday people can become heroes when they are called to action.
A proper topic sentence for this thesis statement addresses that anybody can become a hero when they are called to action. To engrave this in the reader's mind, we can reinforce a more popular idea by stating something to attract them. An example of a topic sentence would be:
While it seems that particular people do special things, ordinary people can do extraordinary things when the time is appropriate.
This sentence highlights the idea that anybody can become a hero in that it states a normal person can do something special at the appropriate time.