If he put his foot on something that is a good sign. The reason that it's on the glass like that is because he is trying to get to the light. I had an anemone do that same thing and then when I got a better light he moved back down to the rocks. I wouldn't sweat it if you've got a MH
comming on thursday, you should really see what kind of light they are in before you see them at the LFS
..... you would be surprised
. I'm pretty sure it'll be okay until you get your new light, and it would probably be okay without it.
Another thing that might freak you out about that little guy if the whole inflating deflating thing. It's normal for it to look like it's dying one minute and then be totally fine the next. So it's not your light that's making him do that, he's just turning your tank into a toilet.
I would actually say that it is a good thing that he's on your glass, it gives you a good chance to look at his foot. Most of the time people look at the tentacles to tell how healthy they think an anemone is, but really if you get a chance to see one's foot when it's attached to something you can really tell. If the foot looks healthy, there is a good chance the anemone is.
hope that helped a little, and good luck with that rose!!