Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-5352890-20130820042051/@comment-209.155.214.162-20130916173333

My take on it was as follows:

Deaton explained to Stiles that 'belief' was essentially what gave the mountain ash its kick; that made the interaction between the Darach and Scott a test of wills.

Scott's desire to protect and persevere won out over the Darach's self-preservation.