Good points Cabby, though there's obviously some differences in local unit procedures. Certainly the units I've flown with have standardised challenge and response pre-landing and emergency drills. I would expect the front seat TFO to challenge me with every appearance of a caution or warning, particularly if I seemed to be doing nothing about it. I'd also expect the rear seat to let control know of any interruption to the task for an aircraft problem, this is why I think things happened so very quickly.