Challenges in mutual awareness in interprofessional collaboration (IPC) along with relational and cultural barriers among professionals disrupt flow and delay decision-making in trauma care. Thus, this study explores team behaviours within IPC in trauma teams during trauma alerts from the perspective of radiographers. A qualitative approach was used with a critical incident technique (CIT) design applying interviews with radiographers within three hospitals in Sweden from May 2022 to May 2023. CIT analysis was conducted with an abductive approach, applying an IPC core competency framework. The results present collaborative requirements in trauma care from radiographers' perspective narrating a distribution of team behaviours within trauma team collaboration and fundamental skills in IPC. Behaviours within interprofessional values and ethics were the most reported incidents related to valuing radiographers' contributions to IPC in acute trauma care. Exploring behaviour through critical incidents associated with core competencies of IPC highlights the importance of interprofessional values as a foundation for successful IPC in the trauma team. The results show deficiencies in inclusive behaviour, influenced by the hierarchical environment of IPC. Power imbalances in this setting are traced to differences in perceived value and shared understanding among team members, possibly rooted in professional identity and culture. A dedicated leader is argued, as the recognition of radiographers' scope of practice in trauma imaging, emphasising the significance of shared decision-making. The findings highlight organisational and relational coordination challenges for optimising competencies in IPC. IPC's success requires reinforcing values and ethics by empowering members' contributions and shared decision-making. This involves clarifying and recognising responsibilities, particularly for radiographers, ensuring their role in trauma imaging is respected and integrated into decision-making.