[Horse-Maiden of the Shire]

I do not think he was overdoing it. I agree with the car theory...and also the getting the wind knocked out of him theory. It's happened to most of us, and we all probably made the same face as Frodo, trying to draw in air,(and if it was our first time) terrified because we didn't know what was going on. So I think he did it just right...but it was kind of weird how everyone else was normal time and then only Frodo was slow motion. I found that strange. To add drama, I suppose.