So, if I have a unit of, say, 15 saurus with a 6+ save, and a Scar-vet in there with a 2+ save, af what point do I get to use the Scar-vet's save?
first of! Saurus has scaly skin 5+ and a shield, that makes it 4+ in total you get to use the scar vets armour save whenever a model choose to attacks him in close combat, a spell hits him for damage (unless it states otherwise) or when he is hit by a ranged weapon (unless stated otherwise).