I’m feeling something more energetic from ‘off’ than from ‘start’ because of its shortness and pronunciation, but I don’t know for sure what effect ‘be off’ has in story telling. Is it exactly same as ‘start’? Just look at the following citation.
”What’s your Quidditch team?” Ron asked.
”Er -- don’t know any,” Harry confessed.
”What!” Ron looked dumbfounded. “Oh, you wait, it’s the best game in the world –“ And he was off, explaining all about the four balls and the positions of the seven players, describing famous games he’d been to with his brothers and the broomstick he’d like to get if he had the money. (Harry Potter 1 [US Version]: p.107-108) [Bold font is mine]
I guess the author chose ‘off’ because Ron entered a new phase of his explanation, and that positively and more eagerly. I’m feeling (or maybe imagining) such energy agrees with off.
Anyway, here are my questions.
1. Which would you like to use in the following fill-in-the-blank question, ‘off’ or ‘start’? And why would you choose it?
“Oh, you wait, it’s the best game in the world –“ And he (???) , explaining …, describing ….
2. If ‘And he was off, doing, doing’ is a common expression, would you give me some examples? (I did tried google search, but I couldn’t do it due to my poor searching skill.)
I might be saying irrelevant things, but nothing venture nothing learn! I’d be glad if you could help me.