Since 2016, the number of minors investigated for activities relating to terrorism in France has increased considerably. This unprecedented phenomenon impacts the work of the judges in juvenile courts and of those in charge of the judicial follow-up of convicted youths. Juvenile protection services find themselves called upon to act upon these swings from a youth that needs protection to a youth from which it might suddenly be necessary to protect oneself. I meet young people within a scheme which offers an alternative to incarceration before trial and both creates the conditions for long-term observation and puts paid to the illusions of de-radicalisation. I explore how a child ends up in this situation – how did s/ he get to such a point? What singular link has connected a child to such and such a famous but unknow liar, watching scenes of horror which nobody in the general run of things can stand to watch, bathed in a univocal discourse where dread marries the apocalyptic character of an answer ? During clinical work the emergence of the figure of “sacrifice”, whose French pronunciation allows it to be rendered in an untranslatable pun as “ça-crie-fils” (“its crying out son”)(“fils” is the word for son), which shows the youth deciding to expiate the sins of a debased father, constitutes a violent and definitive transition.