In the scenario where B5 re-enters without reporting, what is the status of B5?

In the given scenario where B5 re-enters without reporting, the situation is treated as an illegal substitute. This is because players must report properly to the officials before entering the game to ensure fair play and adherence to the rules.

When a player re-enters a game, both the timing and manner of re-entry are critical. Failure to report means that the substitute has not been officially recognized by the officials, which undermines the integrity of player substitutions as outlined in the rules. Therefore, the status of B5 is indeed that of an illegal substitute, leading to potential penalties or actions taken by the officials.

The other options, while they may address different aspects of the rules, do not accurately reflect the consequences of an illegal substitution. Being labeled a legal substitute is misleading since the lack of proper reporting voids the legality of B5’s re-entry. Similarly, stating that B5 is immediately called out or can only re-enter for a designated player does not pertain to the essence of the situation where the initial reporting requirement has not been fulfilled. Thus, recognizing B5's status as illegal is crucial for applying appropriate game management practices.