Stiles had almost forgotten that it was the full moon tonight and he almost forgot that he promised to help Erin with the whole werewolf thing, too, which is why he was running a little late.
When he arrived, he caught the tail end of the conversation. He rolled his eyes and stopped right behind Derek. "I know enough," he said. "And you know it. I mean, I helped Scott. And I helped Malia. I think I can help Erin perfectly fine." He looked past Derek and then smiled at Erin. "Ready to do this?"