most airlines have their own command, easy victor was a code a lot of amercain airlines used to advise the f/a's that an evac was imminent, in UK we use commands such as evacute and undo seatbelts and get out as to english speaking passengers this means some thing easy victor means nothing.
In a pre palnned emergency time permitting we would move pax closer to exits if only a part load,cant comment re upper deck as i dont fly double deckers!