[cmurf]

Maybe it's 25.173(c) https://www.law.cornell.edu/cfr/text/14/25.173

In the working case, MCAS presumably triggers at a particular AoA, trims nose down (but is this a fixed amount and what is it?) which in effect requires more stick back pressure to maintain the angle of attack. Thing is, it seems like MCAS, again in the working case, has a trigger AoA and will incrementally nose down until it goes below some defined angle of attack - which is not really a stick force moderator alone. It's acting as a kind of AoA guardian.