Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-25178327-20131206025300/@comment-7737242-20131219035026

I believe it does have to be two part agreement to be part of the pack.

Another example is Deucalion roaring Scott to transform, even though he wasn't the Alpha that bit him. Deucalion made him shift through his roar, because he was "with him".