"Wow. What is that?" Simon Brimm remembers calling out to his long-time friend, Hillary Green. He and Hillary had been friends since preschool, but they lived in different parts of the state now. They hadn't seen each other all summer. Simon, Hillary, and their families were taking a vacation together before middle school started next week. Zavier Gonzales and his cousins were also vacationing at the seaside that weekend. The wind had picked up and the seas were quite rough as swimmers, water boarders, and surfers struggled to stay afloat. Separated from his family, and adrift on a small raft, it was Xavier that Simon saw bobbing along on the horizon. Separated from his family, and adrift on a small raft, it was Xavier that Simon saw bobbing along on the horizon. What implicit idea is suggested by the author's use of "adrift"?