We seek to demonstrate the value of an "interactional framing" perspective to study field dynamics. Scholars have used the notion of framing to demonstrate how activists tactically use cultural resources to win and mobilize allies (the "us) in targeting opponents (the "them"). However, less attention has been paid to how meanings emerge in situated interactions. These may lead to new parties being implicated and create a shift in the definition of allies and challengers. Drawing on a qualitative study of Occupy London Stock Exchange (LSX) and its serendipitous encounter with St Paul's Cathedral, Church of England, we analyze the dynamics of how interacting parties co-construct issues, frames and relationships. Interactional framing explains why OccupyLSX shifted from its radical protest frame "Capitalism is Crisis" targeting London's stock exchange to a more morally benign quasi-religious frame asking "What would Jesus do?" and thereby, challenging St Paul's on its moral foundation. This prompted St Paul's to revisit its core stance in terms of whether it was a supporter of the underdog or of the privileged elite in the City of London. Two mechanisms, interactional interdependencies and interactional loops shaped these interactions as parties negotiated the meaning of their relationship as antagonists, collaborators or both in the cause for social justice. Privileging situations rather than actors, contributes to a more dynamic understanding of field processes.
Key words: OCCUPY London Stock Exchange, social movements, framing, interactional framing, symbolic interactionism, religion, Church of England.