Cas actually felt more at ease within the maze than he did outside of it. Nature was something he still understood. It was his Father's creation and it was meant to be enjoyed by all of his children. He felt very close to it, even in this weakened state he'd willingly accepted.
"It is," he replied. "Things during the Apocalypse are difficult...though searching for God was a fruitless effort, things such as this help me believe He is still out there."