This brings to mind that QF32 A380 that returned to Singapore with one engine shut down.
When they tried to shut down the other engines, one (#1 I think!), would not shut down and continued to run dispite all attempts.
Finally, the fire services 'drowned' this idling engine with a massive water assault down the intake,
my question is, how easy/quickly did it shut down, and what damage was done to the engine in the process?