Police injured in New Jersey shootout

The video consists of brief opening and closing remarks, including a thank you note.

What does the expression 'So.' imply in a conversation?

How might one interpret the phrase 'Thank you.' in a dialogue?

In what context might someone say 'Thank you.'?

What does the statement 'I don't.' convey in a discussion?

What could be the reason behind saying 'I don't.'?