This study aimed to explore peer bullying events in schools by using Interpretative Phenomenological Analysis (IPA) to consider the experiences of young bystanders: the perceptions and understandings of students who had witnessed bullying. Participants were aged 12-13 and attended two neighbouring secondary schools in the UK. Four themes were generated: the power and limits of language in bullying incidents; the power of moral frameworks; the presence of dynamic social systems, both inside and outside peer groups; and the psychological consequences of being a bystander. Implications of the research are discussed, for the practice of school staff and for educational psychologists. (Contains 1 table.)