The GOPRO recording also shows the control wheel deflected to the right and the captain indicating that they had lost aileron, and requesting rudder input from the FO.
So from video evidence through the cabin window the left aileron was in the maximum up position, earlier conjecture suggesting the fire could have stretched or severed the control linkage (as had happened during another Convair engine fire). That aileron up would tend to a left wing drop / turn - but a left turn wasn't evident in the cabin video. Now it appears from the GoPro footage that the control wheel was deflected to the right which would cause right aileron up, maybe in an attempt to counter an uncommanded left aileron up condition? Both ailerons up, drag from an unfeathered prop, loss of power on the left hand side. I guess if all that was so the only way was down?