The blessing on fire comes through Havdalah, which was reportedly created after Shabbat. Which brings us to a list of 10+ things that were created Erev Shabbat, on twilight. Why these things? Why at that time? Also, 7 things created before the world was created. Plus, the creation of tongs - for which you need tongs. Also: That which was created in partnership with man. Fire... and the mule! Also: Things that are kept from people, including the day of consolation. And things that had to be created for the world to function - including the smell of rot. Plus: The local practice of whether people did work on Tisha B'Av - and the contrast with Yom Kippur.