Red's mother was moving up, panting a little with the exertion and smiling a tight smile for the benefit of Slim in his capacity as guest.
Red's mother wanted to put on a good face for company.
mnli hypothesis: Red's mother wanted to put on a good face for company. premise: Red's mother was moving up, panting a little with the exertion and smiling a tight smile for the benefit of Slim in his capacity as guest.