You say " first of all" as if u have 2nd and 3rd counter points to make but then you don't make them. I'm pretty confident the term arena refers to a type of horde mode since an "arena" is a closed off confined area([i]An arena is an enclosed area, often circular or oval‑shaped[/i], that definition is str8 from Google like a pro). That said what would be your counter if in fact the arena is a type of horde mode?