ada is right. will 是将来时，如果是说他不玩蒸发，应该用虚拟过去时would not have dissapp

will 是将来时，如果是说他不玩蒸发，应该用虚拟过去时would not have dissappeared."you will not dissppear" means you will not dissappear in the future. the fact is, he already dissappeared. so she should say she thought he "would not have dissappeared without a word".