The broadcast occurs during a critical juncture in the game when Batman is navigating through the complex web of challenges set by the Joker and other villains within Arkham City. Oracle, providing her expertise remotely, decodes a series of messages to aid Batman in his quest. The specific sequence 2-7-5 3-2-5 appears as part of a decoding process, which when deciphered, reveals crucial information to Batman.
The sequence provided, 2-7-5 3-2-5, relates to a Vigenère cipher, a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. Without a provided keyword, one might assume that the sequence directly correlates to a simpler form of substitution or numerical-to-alphabetical translation.
3 = C 2 = B 5 = E
However, to offer a solution based on given data: