Queen Elizabeth meeting fire fighters

The transcript captures a brief exchange where initial affirmations lead into a transition towards a main topic, though the details of the topic are not fully elaborated in the text provided.

What emotions or reactions do you think are conveyed in the phrase 'Yes, yes.'?

How does the response 'Yeah.' differ in meaning from 'Yes, yes.'?

In what context do you think the phrase 'Yeah.' would be used?

What do you think the speaker means by saying 'But this is.'?

What might the speaker be referring to with 'this' in 'But this is.'?