Lightfoot halflings have the Naturally Stealthy trait:
You can attempt to hide even when you are obscured only by a creature that is at least one size larger than you.
Can a lightfoot halfling use this trait to hide behind a larger creature while otherwise being observed? Or does the general restriction against hiding while being observed preclude the lightfoot halfling's ability to hide behind a larger creature?
Must the halfling be unobserved before moving behind a larger creature, or does moving behind the larger creature now meet the "unobserved" requirement?