Thing
I think you are right his hand is out of the side window so one of those poles for Selfie extensions which is not a clever thing to do and as a Captain he should know better
if it did detach and go through the engine the bill would be $500 K {{ expensive picture and very irresponsible.
the Jet appears to be on a taxiway so I presume with engine running and not parked up with dead engine before flight. Plain stupid!
Pace