Listen to any comments, especially in the viva.
There might be a question underneath.
The question might be in the comment. It could be a challenge, but that challenge might be a small thing that only needs a small response.
It could be the question comes from you. It could be you listen to your examiner’s comment, and you ask a question to bring that thought into the discussion more. You can find out more, get a sense of why this comment is important to your examiner. Then you’ll see what you need to do to say more.
Or you might listen and realise it’s just a comment.
An idea, nothing big, serious or scary. Just a thought, an “I wonder…”
Something to acknowledge, but nothing to do.