Because sometimes Sithrim has his needs too : he has to be loved, to feel that he's safe, and to feel happy about it. Although it's difficult when your little sister is lost and skittish as hell.
He has a lot to learn in this forest, a lot to discover and to live. Sometimes he wishes he could taste love, passion, but it's always an « epic fail ». He gets lonely sometimes, thinking about past crushes and about her sister too. Where is she ? Where could she be? Is she okay? Everytime he sees a fawn-stalker, he can't control himself - like many other deers who fiercely protect the little ones.
With her sister missing, he is just himself half of the time.
Here is a little picture of his worse vision about the forest : beeing feared. Not only by fawns. But by the world himself.
