Just to clarify, and apologies if Chesty or someone else has repeated this tech in the past 56 pages or so......
The Q400 has FADEC engines and a PEC electronic control to run the propellors.
On approach in icing conditions, they would not have used "reduced Np
but gone for 1050rpm. The condition levers unlike in most turboprops, have detents and will select and maintain (unless at speeds close to VMCA) the selected RPM. Either 1050, 900 or 850rpm.
You use 1050rpm in icing.
The selection is made late in the configuring after initial flap and gear are down, and most likely at flap 15. If they'd just selected flap 15 but it had not fully run, then they should have been at either 850rpm or possibly 900 if in heavy icing and with some vibration due to ice on the props.
Even in this low noise config, pushing the power levers right forward causes a lot of pitch, speed and dynamic motion. Going to the firewall option will give 1050rpm and VERY dynamic motion!
The Q400 is not difficult to operate, but you do have to know the aircraft and get a feel for it, or you can certainly be a hinderance to your colleague alongside you....Read ino that what you will.