So how did the cabin crew even become aware of these two swapping seats? I've seen passengers move to empty seats before take off, I've seen passengers swap seats during boarding or before take off. I've never seen the cabin crew come and tell them to move back, even if they saw them do it. I thought maybe the guy just took that seat and the assigned passenger complained to the crew when he found the guy in it, but in I see in the video the swap seemed to be mutual. Irrespective of the "failed to obey the instructions of the crew" angle, how the hell did it spiral out of control in the first place? There's more to this, and the reasons could be ugly.