The fourteen may have been the "other" Kulna Sawa, capisce?
If the real band were acting as described in the article, then it's still unacceptable.
It appears that passengers must speak up, stand up to break the lavatory que, and risk starting an incident, at every stage of the suspect activity. Timing is critical. Someone has to start it, and risk looking like a jerk, telling the suspects to sit back down, or what have you.