What are the similarities and differences between direct objects and subject complements?

What is the central idea in this advice from branch rickey to jackie robinson?  

Ipronounced his name, offering him at the same time my hand: he took it, smiling and saying, “we shall do very well by-and-by.” then he laid me down, and addressing bessie, charged her to be very careful that i was not disturbed during the night. having given some further directions, and intimates that he should call again the next day, he departed; to my grief: i felt so sheltered and befriended while he sat in the chair near my pillow… (chapter 3) this passage, in which jane first meets the doctor, is an example of

Which literally device involves the repetition of vowels sounds across successive or closely placed words