A multi arena system would be a good idea, i.e. instead of defining several arenas, there are several fights in the same arena.
Explanation :
Player 1 vs Player 2 in the Sand arena
Player 3 vs Player 4 in the Sand arena
However, the 2 groups will not see this, this prevents the arenas from being full all the time.
Obviously block all interactions between group 1 / group 2.
A multi arena system would be a good idea, i.e. instead of defining several arenas, there are several fights in the same arena.
Explanation :
Player 1 vs Player 2 in the Sand arena Player 3 vs Player 4 in the Sand arena
However, the 2 groups will not see this, this prevents the arenas from being full all the time. Obviously block all interactions between group 1 / group 2.