As far as following the directive to stop taking pictures: 1) I doubt very much that when it came down to final resolution that you would even be charged with anything unless the flight personnel were unwavering in stating that you were a security problem. 2) Practically, regardless of the ultimate outcome, this likely means getting processed and missing whatever it was that put you on the plane in the first place. 3) You would also likely get the famed "black mark" on your PNR in perpetuity. 4) Being arrested at the same time as someone being detained for charging the cockpit seems a poor choice of company.
I can see how in this stressed scenario, however, that the participants in the conflict would prefer to not have anything pointed at them - particularly something electronic.