Quote from : The Guardians Crown Parts One and Two Book

Before Gabe could react, he watched helplessly as Rachel slipped backwards and out of sight into the mountainside, a crumbling wall now the only thing he could see. “Rachel!” Gabe shouted, rushing forward. Before Gabe could reach her Haim, being closer to where she had fallen through, leapt into the gaping hole after her. The group now only heard Haim's cries echoing in the darkness as they drifted further away.