I'm seeing broken nacelle parts that are all aft of the actual turbine sections, so isn't this more equivalent to a car muffler/exhaust manifold falling off than any failure of the engine itself (the part that spins and burns and produces power)?
And the loss of the aerodynamic ducting (esp. all those jagged edges of honeycomb from the nacelle) led to both extra drag, and disrupted thrust from the fan, resulting in the extra fuel burn and eventual diversion?
(Plus some drag from e.g. that flap actuator fairing that took a hit from debris)
A 777 Trent in happier condition:
Photos: Boeing 777-232/ER Aircraft Pictures | !!!!!!!!!!!!!!