Stanwell.
I actully have sympathy with your position and as a crewmemebr I've been involved in such situations but the final outcome will not be what we on PPRune think should happen, it will be what a Judge says that the regs say. That may be a compex and difficult decision given the mess that anything to do with Aviation Regs are in.
I refer again to the UA post on the main forum.How would you behave if you realised before door closure that the pax behind you may have been exposed to Ebola as the cabin crew on that aircraft believed ( as reported on the post from the Union)? A blanket ban on pax taking themselves off an aircraft may not be the best thing for the pax or crew based on some experiences that I have had when they were persuaded to remain on board.
Wunwing