Stiles is about to respond when on the other side of the park, the werewolf in question appeared. No idea he was being watched, the drama that was brewing, or really of anything except that they had figured out what apartment they were moving into and he was smiling and being cozy and affectionate with her against a tree out of the main sight of anyone on the walking trail.

The irrational anger in him jumped, and with a simple "Excuse me a moment," he moved past the swings. Who the hell did this guy think he was - moving here, joining Talia's pack, and yet finding some blonde in the parking and making out with her behind a tree?! This was who Cora left him for? This asshole?

So no, before anyone really knew what he was doing - and let's be honest, Stiles had no idea what he was doing either - his fist went flying just as Tyler turned hearing someone approach. The wolf went down, his nose breaking as Stiles cussed and gripped his hand in pain.