Board Thread:False Info and Speculative Discussion/@comment-69.127.101.255-20140905141251/@comment-25222572-20140908070435

Why would you think that was a symptom of a lack of control? He was starting to shift into his Alpha form, which he had shown himself to be in complete control of, throughout the season, using it to great effect. Case in point, that whole incident at the school? He injured Derek so he couldn't interfere, he did NOT kill him. He had a thousand and one chances to kill Scott and Stiles, instead he just trapped them, along with their friends, and manipulated Scott into turning on them.

If he started killing randoms after shifting, or shifting at inopportune moments, then that would show a lack of control. Shifting in the middle of a fight? Why would that show any real lack of control? As to why they showed it that way, moments of the beast breaking through BEFORE the full shift, well, it could be argued that Peter was trying to shift into his Alpha form and kept getting interrupted, OR that the show was just being dramatic.