A common thing to do in film is to have characters who are supposed to be similar to one another or close to one another start dressing similarly. Though Stiles and Derek have yet to share a scene yet in 3b, Derek has spent most of the season looking for, thinking about, and talking about Stiles, and of course, they both keep wearing these ringer shirts. I’m not trying to draw any conclusions from this, because I have no idea what it might mean, but I’m pretty sure it means something.
It wrenches Derek’s arm back, causing Derek to let out a loud yelp of pain. The Nogitsune slaps a hand on the wolf’s chest to keep him from budging from its grasp. A thick pulsating heartbeat throbs right beneath its slender fingers. Everything is suddenly still. The room is thick with tension, suffocating silence settling in the air. The fox leans forward, mouth brushing up the side of its captive’s sweat driveled neck. Then it whispers, voice so soft Derek can barely decipher what it’s saying.
"He’s screaming at me to stop. He doesn’t want me to hurt you. Oh his screams were bad when it came to Coach, with Scott, but-" It laughs now, a sadistic, awful sound that would never have passed through Stiles’ lips. "But with you? They’re basically yelps of a madman. And i’m going to have him sit back and enjoy the show. Let our boy who runs with wolves watch me rip your throat out," then it pauses, a wry grin playing upon its vessel’s lips. "With my teeth."