Our main purpose is to build a simulation describing the persons movements in a public area during a crisis situation. Our running example is about the evacuation process of a supermarket during a fire. The main difficulty of such works comes from the fact that it is generally impossible to obtain precise descriptions of persons behaviors. After several works on individual emotions we are convinced that emotion is well adapted to explain such actions in a situation crisis. In the aim to test our hypothesis, we present here a first simulation (without any emotion management) that is a first step of our main purpose. This simulation aims to describe the well-known fact that, in crisis situation, humans tend toward to help each others. Thus, we test the impact of group constitution on survival rate and on average time. The simulation has been implemented with the platform GAMA.