"At least an automobile's a relatively simple piece of technology and I'd be comfortable with doing a repair on one, even if I never drive one." Sometimes it really is nice to worry about something so mundane.

And in contrast, there is suddenly a purple light show he would have found far stranger if Firestorm hadn't known Green Lantern. But it's not like Hal Jordan was ever known for his attention to detail, and frankly, the Professor hadn't expected the young turtle to whip out a trick like this. "Oh! My word!" There is no panic, just surprise.