In a project where different teams are using different approaches (predictive and agile), it's important to respect the methodologies that each team is comfortable with. Forcing a single approach could disrupt the workflow and productivity of the teams. Instead, allowing the teams to continue with their chosen approaches while gradually adapting to a hybrid model can provide a balance. This approach respects the existing workflows while moving towards a more unified project management approach. The hybrid model combines the strengths of both predictive and agile approaches, providing flexibility and adaptability while maintaining a level of predictability. References: PMBOKGuide - Sixth Edition and Agile Practice Guide (Page 27,
3.1.3 Tailoring Considerations for Knowledge Areas)

Workarounds are unplanned responses. Workarounds deal with negative risk events as they occur. As the name implies, workarounds were not previously known to the project team. The risk event was unplanned, so no contingency plan existed to deal with the risk event, and thus it required a workaround.