While the trim is not too far down, you can still counteract it with elevator (pulling the yoke). But then, MACS kicks in again and pushes the trim further and

While the trim is not too far down, you can still counteract it with elevator (pulling the yoke). But then, MACS kicks in again and pushes the trim further and further down, and if you don't trim up and/or switch the trim cut-out, then you get into the situation where you can't recover anymore using the yoke.