The best thing you can do is just let it do its thing. I dont know if you have or have been, but if you interupt its surroundings you will stress it even more. I wouldnt turn power heads off, I wouldnt keep moving it, ect. I would just let it fight on its own.
I just touched it the time to let it in my tank.It never moved.
I am keeping 7 anemones and I never saw one like this. This one is my first Magnifica