If you notice it, you can see that in the afterlife the Italian girl's pasta is severed right at the level of her neck. I bet the SAS girl went for the throat...
A club is quite big, long, cumbersome, heavy and requires lots of strength to be lethal.
Not necessarily, just give it a good steel head with flanges. Sure you may have to hit multiple times to be sure they're dead, but knocking them out by the first hit will ensure they don't get to screaming and alerting their colleagues.
