This incident happened recently in Milan,a Gulfstream 5,managed out of Farnborough; 2 Captains flying together,just landed, handling pilot asked for igniters off,non handling pilot switched engine fuel shutoff valves off!(these are next to each other on the Gulfstream 5 & 550) Luckily they had enough momentum to roll out of the runway sterile area,but passengers plunged into darkness as APU not on line.Restarted engines taxied to ramp.It is true that if you inadvertantly shut down an egine on these types you can immediately reselect the EFSOV on again (the FADEC will make sure you don't torch the engine).This is not the first time this incident has happened (about 4 years ago the same thing happened)
The outcome appears to be that the handling pilot is being blamed,why? (might have something to do with the non handling pilot and the flight ops director being best mates)