I was reading Harry Potter I. I stumbled over a sentence, written there, whose overall meaning was clear to me but grammatical structure was not clear at all. Here is the sentence:
"Mr. Dursley was enraged to see that a couple of them weren’t young at all; why, that man had to be older than he was, and wearing an emerald-green cloak! The nerve of him!"
Questions:
What kind of use is this "why"?
How does the present participial phrase "and wearing ... cloak!" fit in the sentence grammatically?
Thank you in advance.