First, they praied in a Buddhist shrine like in the first upright picture. Next they go to the fire altar tooting a kind of whistle made by conch shell. After they exorcised evil things using holy phrase, paper, water and arrow, they set fire like in second picture. Finaly, they spread the burnig charchoal, and they walked over the charchal praying for our happiness on their bare feet. Incidentally, the burning was contraled well and charchal was not too hot, every people could participate it on the day. If you want to get your feet helthier, it maight be effective at least.....