Dear Grapho: with regard to that ewe that had coyote eat half of the newborn lamb, she went into shock. "Shock" is a medical term for vascular collapse, which is so complicated I had a hundred page book just on the one topic. When a lion
trips and kills a wildebeest, the prey becomes unable to struggle almost immediately, well before having any important structured damaged. It makes them suffer less.
Wofahulicodoc could tell us more about this.