Yes, amazing that the engine carried on running – maybe because the throttles were intercepted by the remote control?
Also interesting to see all those control cables running under the floor. You wouldn’t see that in an Airbus and that was one of the main reasons why AF447 crashed – in a Boeing the co-pilot would have realised that the junior pilot was holding back the control stick in a blind panic causing the plane to go nose-up and stall.
I have flown in some knackered old 727s quite recently, Okada Airways in Nigeria were using them until they crashed most and cannibalised the rest for spares. You can still see the donors standing near the runway at Lagos with their engine cowlings just empty shells.