Wolfblood S04E05 - The Quiet Hero

T.J. is concerned that his friend Selina's desire to win a Tae-Kwando contest is making her so aggressive she is in danger of transforming into a Wolf blood but her ambition is such that he cannot dissuade her until she finally agrees to withdraw from the contest. However, her citizen's arrest of a mugger shows that she is able of taking action without going too far.