Does this ability effectively make the Rat invisible, making it's opponent flat footed against it's attacks. I think it does, but my DM claims that the Rat can still be seen and is not invisible. He said it's just a big shadow moving around and thus opponents are not flat footed, even though the Rat is still counted as having total concealment. Help?
You can find it here: http://www.d20pfsrd.com/bestiary/monster-listings/undead/shadow/shadow-rat/ rat-shadow-dire
