"Do we need someone to keep watch at night?" Lu Yun asked obediently as she crawled into her sleeping bag, finding the stone-processed ground indeed warm and comfortable.
"Yes, we'll take turns, one person for one to two hours should suffice. I'll take your shift so you can sleep soundly," Shitou nodded.
"Oh," Lu Yun nodded without objection and crawled further into the sleeping bag, turning her head to see the others also doing as Shitou did, using the specially collected and heated stones to pave the ground...
She watched for a while then closed her eyes, feeling sluggish. As sleepiness crept up on her, she overheard Shitou say, "When using this method, one must be extremely cautious. You absolutely must not use damp or porous stones or rocks. Such stones or rocks can explode once heated, and if you're unlucky, you could very well end up losing your eyesight or worse. Anyone who doesn't want to get hurt better remember this firmly..."
