DonH - while not wishing to keep on clapping my hands to keep the damn Oozlum bird flying, surely it is equally an 'onus' on any crew, knowing the existing reduced seperation, to add to John S's simple doctrine "I must try not to climb or descend into/through another aircraft's level". Hence the 447 PNF should have been 'screaming' to PF about the excursion in no uncertain terms and taking control if necessary?