Don't panic just yet.
Last week, the power at my house was out for 26 HOURS ! The only thing that was running the entire time was my battery powered airstone.
Your coral is hardier tha you think it is, Just give it time to recover from the shock, and it should be ok.
The only thing in my tank that looked "funny" after my power outage was my colt coral. After a week, it's back to normal.