Board Thread:False Info and Speculative Discussion/@comment-26829181-20150825132559/@comment-4295751-20150826144059

I think (may or may not be true) alpha roar requires either a powerful alpha to override the beta's will, and/or the beta's submission.

Peter and Deuc's roars worked even though Scott was unwilling, because they were pretty powerful alphas. Scott isn't that powerful, but since Aiden and Ethan looked at him as their alphas, his roar turned them into puppies. Derek's roar didn't work on Cora and Boyd, because they were too out of control that they actually tried to kill people. And Scott didn't/doesn't use it on Liam, because he's not the type of alpha to maintain dominance on his betas, he wants them to trust him.

About how Scott's roar changed Malia, well.. I can only think because Scott was too damn focused..