Roadtrip got it right. This is a situation where someone (unfortunately) snatched defeat from the jaws of victory.
It really boils down to complacency derived from some really reliable airplanes and the "fact" that this stuff never happens to me.
To Mr. Yeager: If you are who you say you are, Greetings and Salutations, I am Admiral Horatio Hornblower.
To the guys who wonder how an engineless A330 can still maintain flight controls, well, engines are engines. The rule of thumb is: if you can maintain 7% N2, you'll get hydraulic pressure from the pumps. It won't be great, but it will be there. As long as you don't try aerobatics, you will survive.
If you pull the fire handle, all bets are off.
On the bus, switching the fuel lever to off closes the LP valve, which kills the engine and shuts the familiar (fuel) firewall shutoff valve.
It's the same thing.
LP Valve = Firewall Shutoff valve.
If you pull the fire handle, the engine will be isolated, oh yeah, but you lose the hydraulics and pneumatics on that engine as well.
If you just shut the dang thing down, the engine fuel is cut off at the firewall, but you still have capability to get hydraulic power from the engine (no, bleed is gone).
It's a fine line. Put it this way: On the Bus: If you are not on fire, don't pull the fire handle.
My babbling 2 cents.
PB