Using the notes of Ferenczi throughout the Clinical Diary, I recomposed his work with patient B., through which, together with patient R.N., Ferenczi came to encounter the psychogenesis of trauma and mental shock, urging him to develop a theory and a technique of working with trauma, constantly seeking healing and treatment. Based on this clinical excerpt, I discuss about trauma, approached theoretically and technically, emphasizing both the importance of knowing the mechanisms of trauma and the importance of healing, through communication from affect to affect, which allows a chance for rearrangement.