What are you gonna do about it

.. It's done so i don't think there is anything you can do. I'm sure it will be fine. I'm amazed I got it down. I've seen fish attack a bristle worm and let it go after about a sec or two.
I wouldn't so much worry just check on it for a few days to make sure it's eating. I'm sure there's gotta be something that eats bristle worms in the wild or else the ocean would be full of only bristle worms. Good luck and looks like te fish had its Easter meal LOL..