Impact: show what the boy was vigorous, active, lively, energetic, effervescent and cheerful.
Explanation:
The word "vivid" can fit perfectly into the sentence shown above and encompasses the meaning of the two words enclosed in parentheses. The use of the word "vivid" shows that Sidney's brother is a very active boy and that he is excited about the game, showing himself to be very vivid, vigorous and happy,
D. Bilbo fears all Wargs because they are allies of the goblins. He is assuming that every Warg is out to get them because they are not aligned with the goblins and the Wargs are.
A possible disadvantage to hearing this scene as opposed to reading it silently is the Mrs. Hale may not be present and can be misinterpreted incorrectly.