"I've never been chasing anyone down the runway but if *I WERE TO DO THAT* I wouldn't drive just behind the engine."


I don’t understand the marked part of the sentence: meaning, gramma… Could you explain it to me, please?

查看翻譯

The speaker has never chased anyone down a runaway.

"If I were to do that" is the speaker adding that if he ever did need to chase someone down a runway, he wouldn't drive just behind the engine.

This statement implies that the topic of someone else chasing someone down a runway while driving behind the engine.

The writing should also be wrote similar to -

"I''ve never been chasing anyone down the runway but, if I were to do that, I wouldn't drive just behind the engine."

"If I were to do that" is extra wording being used to add emphasis to something the speaker would or wouldn't do. The part could be removed and the sentence would still mean the same thing.