Is the Emeril pan enameled? If so, you didn't do anything wrong.
If not, it is really, really difficult to seriously damage cast iron. If you see rust, scrub it off with a scouring pad, and then re-season.
I just got back from vacation to find that I had left my cast iron pan soaking for a week.
The sink suffered worse than the pan--took me a while to scrub the rust ring off the bottom.