FBW390
You are missing my point.
It is unfair to criticise a fellow colleague, without having your own explanation, of what YOU would have done to identify the perpetrator, or ensure 100% safety to continue the flight.
We all operate in an environment of compromise between sensible practicable safety measures, and completing the operation we are employed for.
Can you please explain what you would have done in this situation, without a confession from the guilty?