At the very edge of the barrier, a ghost lingers - arms folded, foot tapping, regarding the obstacle with the critical eye of someone stumped. He'd gotten a few respectable feet in, but by then it had felt like being stuck in the bottle again. At that point, Giles had quickly retreated, with the air itself feeling as though it were shoving him back outside, so much so that he'd actually stumbled upon reaching the open air again.

Perhaps magic might serve him better...or perhaps turning himself invisible, which in the past has at least served to make it easier for people to pass through him.