Well i know it was a good story that's for sure and I would help you but............ you won learn to do anything that way and all you need to do is read those chapters and write what happened in a shorter form so i don't really see what you need help on, your just being lazy and don't wanna read which is horrible.
The answer is : The cow is under the tree
The purpose of personification in the above excerpt is to give human characteristic to death which is considered to be a non human. Writers usually use personification in their write ups in order to bring an inanimate objects to life so that their actions and natures will be better understood.
The figurative language is “like a ball”. It’s an simile since he’s comparing the fall to a rolling ball. Well he’s comparing the way he fell like an ball rolling down the stairs.