After he achieves "Ascension" into the gigantic demon known as Olvikan during Sunnydale High's graduation ceremony, he eats Principal Snyder and then battles the entire graduating class, who had come prepared for battle.
After he achieves Ascension into the gigantic demon known as Olvikan during Sunnydale High's graduation ceremony in 1999. He eats Principal Snyder and then battles the entire graduating class, who had come prepared for battle.