premise: One gentleman in a hat and off white shirt is chatting with another gentleman in a black shirt while they are sipping hot drinks. hypothesis: two gentlemen talk while they drink.
entailment: Two gentleman talk while they drink is a simpler and shorter way of saying one gentleman is chatting with another gentleman while they are sipping drinks. Chatting can be used interchangeably for talk. And the act of sipping occurs while one is drinking.