As I'm getting bored. . . . . did we discuss whether there was any chance that they encountered wake turbulence descending from a heavy departure ahead ?. . . . . or how about (if the aircraft was de-iced) Capt's foot slipped off rudder pedal (which due to x-wind he was holding a bit of force on) due to doing walk-round in pools of the slimy stuff. ( happened to me taxying, fortunately I got back on to the brakes in time
) Well may as well get all the strange ideas out the way now before someone actually allows facts to get in the way.