Nevertheless, Harry was determined to find out more about Riddle, so next day at break, he headed for the trophy room to examine Riddle’s special award, accompanied by an interested Hermione and a thoroughly unconvinced Ron, who told them he’d seen enough of the trophy room to last him a lifetime. (Harry Potter and the Chamber of Secrets)
Why are there articles preceding the modified proper nouns? It reads okay to me but it's rather strange, can you explain it.
Would "accompanied by interested Hermione and thoroughly unconvinced Ron" be correct?