Samfrey

"Good," he answered, "let's take this to the arena then."

Though Iris gave him a worried look, he assured her with a pat on the head as they moved to the public arena of the Hollow Foundation, along with all of the adventurers present, and some others who just wanted to watch the fight. 

As he left Gladiolus' sector, he was met in the hall with the presence of the Outlanders now occupying the sector directly across–only a few steps away outside of its door. 

I forgot about that…right, Sirius told me, he thought. 

"The Arena", only permitted to be used by gold-ranks and above: it's the one place within the foundation that allows fighting between two consenting adventurers. Though most higher-rank guilds possess their own private arena, the main one within the foundation attracts a gambling crowd. 

"Wooo!"

"Get 'im!"

"Five coins on the Gladiolus boss!"