Board Thread:Legitimate Canon Questions/@comment-25178327-20140116033806

SPOILERS ARE AHEAD

In episode 7 of season 3, Derek accidently kills Boyd after Kali throws him on Dereks claws. Right after, Derek's red eyes got a little brighter then they were before. Was this because it "darkened his soul" (what Peter said about killing an innocent such as Paige or Boyd), or was it him getting stronger after killing one of his betas?

Any answer is apreciated, so thank you! 