Though Derek and Scott did not always see eye-to-eye, Scott sums it up perfectly in the movie, the two were like "brothers."

While the team is battling the Oni, Scott, Derek, and Derek's teenage son Eli (Vince Mattis) are faced with taking down the powerful trickster demon known as the Nogitsune.

In the final moments of the battle, Scott and Derek are holding down the Nogitsune. Malia's (somewhat?) boyfriend Jordan Parrish — who is a Hellhound and is able to control fire — steps up to burn the demon back to hell. But, he tells the two werewolves that he cannot burn the Nogitsune while Scott and Derek are holding him because they too will be consumed by the fire.

Looking at his son Eli and his longtime friends, Derek decides to sacrifice himself and allows Jordan to set both him and the Nogitsune on fire. In the final moments of Derek's death, his werewolf eyes turn from blue to red.

So, what does that mean?