It's an open world game, but let's assume you mean local map.
In that case, let's assume that each player waves (/wave). I've done this before with >50 players and took a screenshot and we were all in sync. It's also possible to have 50 players in the same area fighting in real time, e.g., in a battleground. This was back in 2010 when I played ... So I am not sure if it's any fabrication at all, otherwise everyone would die, etc? Given players have health, take damage, get healed, etc.
In that case, let's assume that each player waves (/wave). I've done this before with >50 players and took a screenshot and we were all in sync. It's also possible to have 50 players in the same area fighting in real time, e.g., in a battleground. This was back in 2010 when I played ... So I am not sure if it's any fabrication at all, otherwise everyone would die, etc? Given players have health, take damage, get healed, etc.