What???!!!

I left for four days. I have a saltwater tank, 55 gal. It contains two clownfish, a trigger fish... A blue lobster and before I left, a young fake rose anemone...
Upon my return my clownfish look lost and frantic! No anemone to be found and where it resided... The blue lobster left its shedding...Is it possible that my lobster ate my anemone??? I see no other explanation... I want to know why!?!?!? After I find out IF. Please educate me???