Glory didn't fall off the structure. But she was bleeding now, and weak, but she was still Glory, still a God, and even with the spell, even with the sword, even with her injuries she would recover in time.
So she did the only thing she could. She let the weak little mortal take over. Buffy cared about him, worried about him, tried to help him. The Watcher had killed him, she was utterly convinced that Buffy didn't have it in her.
Ben for his part looked up at Buffy and over to Dawn, scared and terrified. Weak and tired but still clinging to life, clinging to his want, his need to live.
"I got her contained now Buffy, weak...I was fighting, I can just...go, ask the Powers or something I'll leave LA. Come on Buffy, I'll do anything"