The author says that ralph has come to a point where he has to watch his feet. this is not only because of the physical terrain. why else might ralph need to watch his feet? from the lord of the flies

In paragraph 5, president obama remarks: “you know, when trayvon martin was first shot i said that this could have been my son. another way of saying that is trayvon martin could have been me 35 years ago.” how does president obama use rhetoric in this quote to contribute to the overall meaning of his speech?