After twenty seconds or so at idle power (most people don't know it takes that long at idle after you pull the handle to get shutdown)
On the B777, the fire handle closes the HP valve as well, so its like a normal shutdown.
On the BA Tristar there was a MEL item that had you pulling the fire handle on every shutdown. I believe it was with APU Bleed air inop. You shut down Nbr 3 eng on the fire handle, and maint then chkd that the HPSOV was closed when you reset it. Yes it took about a minute to shut down on the fire handle.