Panic clutched my stomach and closed my throat and finally it was too much, I couldn’t keep going. I stopped in the middle of a tunnel which continued, it seemed, to infinity, and when Momus came back for me I refused to take even one more step.
“Come on,” Momus said, “we’re almost there.”
“I can’t,” I said.
“Why not?”
“I just can’t.”
“Come on. Be brave.”