Nothing. Their duty is to guard the tomb and there should be no reason at all to when they stop. When changing guards maybe but someone is still there watching.
the correct answers are 1. ineffective; unanswerable, 2. ineffective; too broad, 3. ineffective; too narrow, 4. effective; clear and complex.
(I went over this story last year lol)
She changed by becoming more confident. Her view on herself and her brother has changed and instead of reaching for what she thinks is her goal, she finds a greater goal, which is supporting her brother.