I think that puts you in a very dangerous position. If he doesn't want to be "found out", you never know what will unfold. I would take the standard protocol of getting out and reporting and warning other pilgrims.
From the responses received on this topic, I find there are two sides, and that was expected. There are those who have had violent experiences and those who have not. I pray for those who have lived through violence and am very happy that it was survived. Yes, it can be traumatic.
For those who have not seen violence, I pray that you never do.
For me, I have seen violence, too much. I minded my own business throughout my life. And I did that too much as well. One night, I witnessed a man beating a woman, and I did nothing to stop it. That guilt remains with me now and will remain with me. That event changed me. I felt that I was a victim also. I could never remove the pain inflicted on her. I could not go back and stop it from happeneing.
When I found Aikido & Ki, it was being taught by my own church Minister. He retired a few years later and passed the school on to me to continue. Over the decades, I went through a number of stages, including humbleness, confidence and then back to being very humble, knowing the power and extent of my growing abilities.
Aikido is a purely defensive art. It teaches no offensive movements or ideoogy.
Being a victim is giving control over. It is not a state that anyone wishes. In the case of an exhibitionist, first, the assailant suffers from a mental disorder. If knowing exatly what to do when presented with a flasher, consult local authorities. I have done that annually since 1983, as well as extensive studies into the cause, diagnosis and prescribed treatment of this and many other disorders that can germinate the potential for violent behavior. Diagnostic and Statistical Manuals III, IV and the most recent Edition V will provide all that information.
Why study psychological disorders so deeply? To understand an attacker before the attack is to ensure a positive outcome. Win / Lose has nothing to do with this. That is the essence of Aikido.
The meaning of Aikido will explain;
Ai - Harmony, working "together."
Ki - inner energy, same as Chi in Chinese, ie, Tai Chi, or life frce
Do - (pronounced doe), way, path, way of living.
In the use of Aikido, I am responsible for the well being of my attacker, to blend with their attacking energy, turn it around to show the error of it and finish with an outcome that does no damage, and promotes understanding.
If it were not being offered by my own Minister when I began training, I may not have continued, to this day. In our many discussions, the topic of Aikido being the most Christian of the martial arts, was a main topic. Kung Fu shares these same values. Most other martial arts are supposed to do the same but get muddied by many things such as personal ego and do not forget Hollywood, not very well known for its grasp of integrity.
To sum up, everything I have contributed to this thread, story, issue, comes from my professional experience which is backed by decades of psychological research and understanding, and the continuous instruction from Police Authorities. Will I laugh? Likely. It is recommended to shame the asailant and demean his actions. Would that anger and promote an attack? Not likely. Attack is a very large step for an exhibitionist. Regardless of how anyone chooses to handle this type of issue on the Camnio or anywhere else, understand first that the assailant is in need of psychological help. There is no shame in having a mental disorder and there should be no shame in it being recognized and treated.