All accidents and crises do not happen in public places. Sometimes they occur in ‘private’ places, such as schools. In such cases, emergency response organizations work at incident sites located at other people’s workplaces. The aim of this study is to investigate the relationship between professionals of two different workplaces, when one workplace (the incident site) is temporarily organized at another, permanent workplace (a school or a special home for the elderly). This means that new activities are temporarily organized, by newcomers, on somebody else’s home ground. The relations between ‘the established’ and ‘the newcomers’ are in focus. The data consist of interviews made with rescue workers and personnel at schools and elderly care centers. In the present study, mutual adaptation between the two groups occurred, resulting primarily in parallelism; both groups worked independently of each other. Both groups tried to manage the crisis situation, but in different ways. Emergency response personnel trying to eliminate the immediate cause of the crisis, and school and elderly care personnel tried to maintain their normal functions in an unknown situation by adapting their task performance. Even though parallelism between the two groups was the dominant pattern, it was also the case that the direct crisis management of the emergency personnel took precedence over the indirect crisis management of school and elderly care personnel, e.g., when the school and elderly care personnel left the scene to the rescue workers.