There's lil hope that it will survive since its foot is damaged.
I do not think that the PH pushed it overnight but it moved there on its own. Anems can move quite quickly if they don't like their current place. Just leave it alone, don't touch/move it or u'll risk damaging it more.
My first experience with anem was a Pink tipped haitain anem. I messed/moved/pulled it alot, trying to get it to stay somewhere viewable. I noticed that the more i move it, the more it will try to relocate itself. I ended up damaging its foot
. So try not to "control" it too much