Purple Anemone **help please**

[Nicole8ca]

About 2 weeks ago my roommate called me (panicked) saying my purple anemone was eating my hammerhead coral. I had a 15 minutes conversation to calm her down and try and figure out what was really going on but I'm still unclear. Anyway she said she "poked" it until it left the coral alone.

Since then the anemone has been acting a bit strange (not active and full). I look at everyday to see if I can see any damage from the "poking" and I can't see anything but then today I came home and it appears as though it's trying to hide in the rocks.

So my questions are.

1. Does anybody know what to do?
2. If my anemone is in fact dying, will it kill my whole tank (I've heard that can happen).

please help.

Thanks!