If you have a Door and are singularly motivated. Would Lan Wangji have gone looking to retrieve Wei Ying's soul, if he could have, if such things were possible in his world? He suspects not. He believed that Wei Ying's spirit was destroyed, beyond recovery or reincarnation. Since he has lapsed into silence contemplating this, he plucks a lettuce leaf from his qiankun pouch and proffers it to Kade.