You and your partner get a central question with five prompts around it, the 'bubbles'. First you talk together about the prompts for about two minutes. Then the examiner asks a new question, and you have about a minute to reach a decision.
This part tests interaction above all: how well you listen, respond, build on your partner's ideas and move the conversation on. You don't have to agree, but you do have to discuss.
You don't need to cover all five prompts. Two or three explored in depth are better than five mentioned in passing. Always link each prompt back to the central question, instead of talking about it in general.
Don't just wait for your turn. Pick up what your partner said and add to it: 'That's true, and it also means...' or 'Going back to what you said about...'. This is exactly what the examiner is listening for.
Bring your partner in with open questions: 'What's your view on this one?' or 'How do you think it affects...?'. Share the time fairly: taking over the discussion doesn't earn extra marks.
When a prompt has been covered, move on smoothly: 'Shall we look at this one?' or 'What about...?'. It keeps the discussion flowing and shows you can manage a conversation.
In the last minute, the new question usually asks you to choose one prompt. Don't restart the whole discussion: weigh up the strongest options, suggest one and try to agree. Agreeing to disagree is fine, too.
Here there's no partner, so play both roles: make a point, imagine a reply and respond to it. Use the two examiner lines shown with the task to practise both stages: the discussion, then the decision.