First, according to the rule, players cannot use Truce Agreement (bubble) while occupying the City of Throne, Throne Tower, Hero Tower, and Magic Tower during the Server War. However, there is a caching problem in the game. The player is in a state with no bubble, but due to caching data, it still looks like there is a bubble on the surface. In addition, the player who occupies the throne can choose to transfer the throne to an ally, and the transferred ally will become the current occupant of the throne. On this occasion, the assignor still has bubble since he or she didn’t send troops to the throne.