When Derek started coaching his grasshopper of a werewolf, Scott, he repeatedly emphasized that Allison's mere presence would make him weak. It turned out, however, that Derek was completely wrong--she is the one person that calms him and can prevent a shift. But now that they've broken up (and Derek's maybe-lunch meat), he's all on his own.
Check out this sneak peek of Monday night's all-new episode of "Teen Wolf," where Stiles finds his best friend having a panic attack in the school shower. Scott's devastated over the split and it's making him enraged...like he wants to kill someone.