Fanaelialae
Legend
Here's the problem, its not fluff, its the FREAKING WORD THEY USE TO DEFINE IT. Nobody reasonable can look at the predator while hes in stealth mode and go "ZOMG ITS INVISIBLE"
I feel Invisible is not what it should be in this edition. Invisibility should be a much higher level spell/ability, and should automatically grant everything "hidden" does.
In 4e, you can knock an ooze prone. You can bleed a skeleton (cause it untyped ongoing damage). You can blind an elemental.
In case it wasn't obvious, not everything in this edition is meant to be taken literally. Sometimes you have to engage your imagination to sensibly rationalize odd mechanics.
If the best invisibility spell in the world leaves behind a "shimmer", then that is the definition of invisibility in 4e.