Sheep will scatter and run from a predator. However once caught and in a grip, they will do nothing as if to invite death more quickly without making the whole thing even more unpleasant than it already is.
A female ewe with lambs will defy all rules and snap you in two faster than you can see her coming. A male will take on the front end of a truck or tractor. Mine did. The score was Sheep (1) and Tractor (0) and a month for the tractor in the repair shop.