Originally Posted by
Linktrained
The Captain ( and the other two pilots) may well have seen that the THS was moving, as it does, usually and quite normally, untouched by human hand, but may not have noticed that the direction was (largely?) NU.
In fact the THS was almost fully-NU by the time the Captain arrived, and as such the abnormality would have been that the trim *wasn't* moving much despite the fact that their pitch was all over the place.