There is considerable support for the idea that an atmosphere of safety can foster learning in groups, especially during ethics training courses. However, the question how safety dynamics works during ethics courses is still understudied. This article aims to investigate safety dynamics by examining a critical incident during a military ethics train-the trainer course during which safety was threatened. We examine this incident by means of a four-factor analysis model from the field of Theme-Centered Interaction (TCI). We show that during ethics training courses a safety paradox can occur, involving a tension between honesty and openness to other perspectives and values. Finally, we discuss how trainers can foster safety during ethics training.