Surprise attack them. Watch where they go and plan out a way to get them when they are in the most secluded place. Walk up to them as if you are going to talk to them, then lay em out with a punch to the nose. Then have you and your group members stomp him or her out. Do not beat them too bad though, they can die Also, if you know this person, a ski mask and a fake voice would be preferable.
