During the simulation, participants experience different degrees of stress and anxiety. It could be described as “Anxiety is like perpetually hearing the enemy music but never seeing the threat”. This study aimed to describe the Emergency Medical Services personnel's feelings of anxiety during simulation. The study had a qualitative design with interviews of 28 participants. The data were analyzed using content analysis. The result shows how the simulation could be perceived as a stage performance in the form of a theatre. The perceived acting was unpleasant and embarrassing due to unfamiliarity to perform. To be scrutinized meant having spectators reviewing ones' performance. It was considered more natural to care for actors than manikins. The interaction and connection with a human, even unconscious, were more natural. To care for a human did not require the imagination to empathize in the simulation.