Critically Discuss what the Social Psychology Student Was Referring to in the Above Scenario Using a Theory of Pro-Social Behaviour as a Framework

Lily is 13 years old and tall for her age. One afternoon, she confronts a suspicious-looking stranger loitering near a young girl playing in the local park. The stranger takes to his heels when Lily challenges him. Lily's bravery is the talk of the neighbourhood. On hearing of this a student who is studying social psychology makes the comment: It's just as well Lily's usual playmates were not around or that little girl might not have received any help (Vaughan and Hogg, 2005, p. 358).
…