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Hydraulic lines are severed to elevator and rudder servos, loss of pressure allows the control surfaces to flutter, as they are now not held "stiff" relative to the HS and VS. Remember that these surfaces are not mass balanced, relying on hydraulic actuators to prevent flutter.
problem with both electrical and or loss of hydraulic.
Your comment would be correcct IF hydraulic clyinders were directly used to position HS. BUT both systems drive motors which turn the jackscrew
Any cutting of wires or hydraulic lines would simply leave the jackscrew non moveable by rotation, and absent other issues HS would stay in place.
