Peter in “Unfinished Business”

Peter

[to Kate about the triskelion] Derek gave up on it back when he learned another way to control the shift. One I taught him. I taught him to use emotion. To use anger. And to focus on it, to feel every ounce of rage and hatred he that he could summon. It was the anger that taught him control. So, you want to learn to control it? You want to get angry, Kate? Let's get angry!