If all looks normal to both pilots(three in this case) then the NFP places his hand on the Condition Lever and again asks the FP to confirm he has the correct Condition Lever. THEN you bring the Condition Lever to the Cut Off or Shut Off position.
On the ATR you even have an intermediate position before fuel shut off, called feather, and you really don't want to go past that point unless you are 100% certain. I doesn't take that long to unfeather the propeller again.