And of course you would also give us the type of aircraft involved in your ckecklist?
The FO in the ATR has to go back through the bag compartment to evacuate (which might be a bit of trouble firsthand), potentially disrupting the pax flow and creating confusion. Also by doing this he has to knock over the FA standing there yelling the pax out of the airplane...
Procedures are common to a TYPE, but not necessarily accross the board of all types existing!