Back to basics.
A prop turning at 1200rpm is producing lift forwards.
assuming that it's still attached to an engine centerline
The prop on coming loose will out accelerate the aircraft.
it will quickly stall out lift and lose rotational speed due to drag
A turbine blade turning at 30,000rpm coming loose will move sideways.
at least tangential until it hits something like another blade in which case it gets deflected fore or aft