What happens when Ethan and his friends reach the Great Barrier?

When Ethan and his friends finally find the Great Barrier, Ethan finally realizes what his mother was trying to tell him about Macon and the Arclight. Ethan’s mother, Lila, imprisoned Macon in the Arclight to save him from death. Ethan and Liv release Macon just in time for him to help them rescue Lena.