Eh? Standard American and British usage is the same with regard to quotes that span multiple paragraphs. Given that it's understood that speakers can alternate

Eh? Standard American and British usage is the same with regard to quotes that span multiple paragraphs. Given that it's understood that speakers can alternate without each quote being attributed, e.g.: Bob said: "Any opinion on this, John?" John said: "I have two things to say." "What are they?" "One of these things is this. "The other thing is this." – how would you punctuate that? If you close each paragraph with a quote, then there's no way to tell who's speaking except to label each paragraph: Bob said: "Any opinion on this, John?" John said: "I have two things to say." Bob asked: "What are they?" John answered: "One of these things is this." John continued: "The other thing is this." And if you don't open each quoted paragraph with a quote, it's very hard to tell which paragraphs are quoted: John said: "I have two things to say. One of these things is this. The other thing is this." The third thing, he kept to himself.