“Spiral,” by Steven S. DeKnight
“Spiral” is one of those episodes that starts right where its predecessor left off. Dawn’s secret has been exposed, and so Buffy scoops her up and runs like a terrified antelope. It shouldn’t work, but Willow slows Glory briefly. Then, after running at super-blurry cheetah speed to catch up with them, she foolishly pauses for the traditional pre-victory exchange of taunts... in the middle of a busy road.
This turns out badly for Glory when a big truck smashes right into her, and very well indeed for Buffy when the impact then causes Ben to take over custody of the shared BenGlorious bod. It’s nice for us because we get Ben in a dress again. There are worse things, though it’s not a fabulous dress.