Derek is shown smiling as he sits at a campfire with the rest of his pack. Peter's voice is heard

Peter: its foolish of you....you're making yourself extremely vulnerable

Derek is shown wrestling around on the ground with Scott and Isaac

Derek: they're my family

Derek is then shown running shirtless through the woods

Peter: You shouldn't trust them as much as you do.....you.never how easily....one can be convinced

Derek: convinced to do what?

The promo then shows Derek on his knees in the woods as theres blood on his face and tears slide down his face. He looks up at whoever is standing infront of him

Derek: You were my brother!!!!!!!