Its the exchange with DW and his continued saying, that the THS was driven by the NU SS input of the crew. And that is not correct, imho it had no effect at all, because only a continued SS ND input would have prevented the THS from moving NU.
I think it is both: The THS movement was driven by the continued NU SS input, and
(after the stall) only a continued SS ND input would have stopped or reversed it.