Waldo is right.
Subject 1.Old cessna with full 40 deg flap
2.Full slip with full rudder
3.Low airspeed. But not a lot lower than normal speed for a 40deg final approach speed.
can't say as what speed though as position error on IAS is huge (and dependent on slip to left or right)
There is a slight turbulence felt through the control column which is a sure sign you are close enough to disaster. Ignore this and maintain the controls(or knock another knot or two off the speed) and there is a violent instantaneous pitch down.
Truly alarming.