This is also a good approach for when travelling, or even just out, with one or two friends. Agree a set of escalating code words or actions that mean somethin

This is also a good approach for when travelling, or even just out, with one or two friends. Agree a set of escalating code words or actions that mean something like "take care", "come help me with this situation" and "we are leaving now, no questions asked." Give everybody the power to make these signals and ensure that everybody else reacts immediately. We all sense danger differently, and the best way to avoid problems is to work as a group, and to trust the people who you are friends with.