The old man is 藤安将平, Shohei FUJIYASU, one of the few Japanese sword masters. Japanese sword, 刀 KATANA, is made through many processes. He is now forging the iron.
A smartphone game in which swords are anthropomorphized is popular among young women. A lot of game fans gathered to watch KATANA forging exhibition.
Look at the sparks ! Aren't they beautiful ? The master heats the iron in burning charcoal.