When the wolf king releases his wind blade, it does so in such a way that the rest of his pack is attacking Bing'er with its wind blade. The wolf king knows that Bing is important to him, so he casts its blade at her. The rest of the pack does not attack, because they know that she is in danger. . The other wolves do not attack because they do not want to be caught in the crossfire of the wolf's attack. Instead, they attack because the wolf knows that they will be killed if they fail to kill Bing.