After receiving the report from her staff, Anko senses that Orochimaru has snuck into the examination.
In other words, this is a dangerous Jutsu
which relies on a secret technique
أي أنّها تقنية خطيرة تعتمد 
على أسلوب سرّيّ يحرّر القوّة
In pratica è una tecnica pericolosa