This stood out to me when editing as well. So much so that I almost removed the sentence. I left it in thinking I was missing something. The main reason was because nothing much made sense :] You would be standing on Deimos looking at Mars, with Phobos in view, then Phobos is not the correct shape at all. Then you would also have a gravity issue too.
If you are on the Earth, looking at Mars and Phobos this close to the Earth was just as wrong :]
Anyway, nothing seemed correct to me, so I left it as it was.