CLEAN : EU US ministers talk joint action against jihadist threat

The transcript includes a brief mention of a percentage, followed by a retraction or clarification.

What does the percentage '90%' refer to in the context of the text?

How does the tone of the text change from the first part to the second part?

What could be the implications of stating '90%' in a conversation?

What might the speaker be referring to when they say 'Oh, never mind.'?

In what situations might someone say 'Oh, never mind.'?