Board Thread:Speculation House/@comment-108.69.217.22-20160217014404/@comment-62.209.14.157-20160222082845

Considering the amount of Grimm around them at the time, it wouldn't have been practical for him to do something like that, even if he'd wanted to.

Something I find odd, though, is that he didn't seem to be quite so ... unstable in the flashback in "Beginning of the End". I mean, he was upset after Blake left (understandably so), but he wasn't about to hunt her down and destroy her life, either. He even told the White Fang lieutenant not to bother finding her.

I think the incident with the train in the S2 finale has something to do with how angry he is towards Blake. After it, he openly volunteers the White Fang's services to Cinder's group even though he could have easily lied and said none of the members would follow him anymore if he kept supporting her cause. (Though, now that I think about it, Tukson did try to leave, so it probably wouldn't have been a complete lie.)

But consider this: several members of the White Fang died in the train event, and from the survivor's reports, Adam would have easily figured out that Blake was involved in the failure of the plan. That was what could have set him off. Seriously, Blake not only left when he probably needed her support the most, but also had a hand in the deaths of his comrades. It likely felt as if she was spitting on his face, especially since she's referred to him as a 'mentor' and so he's probably the one who taught her how to fight in the first place. Of course, none of this justifies what he does to Yang and Blake.

In any case, he really can just be a yandere who went mad after his object of affection ran away. That works, too, I guess.