Hindsight and all that, let’s assume (bad word choice I know) that the order to deplane IS lawful under those particular circumstances, why not deplane everybody?
Why go after a single seat forcefully (target fixation), when it should have been easier to sort things out at the terminal, and when ALL pax were supposedly under the same obligation to deplane if given the command to do so (as they were later while they had to sanitize the aircraft).
Case study gold material.