Willow knew she should say something witty in response. If Buffy were here, she'd have something to say. Faith too. Heck, even Cordelia could probably come up with something pretty quickly. Willow, though, was drawing a complete blank.
Then she was struggling just to remain upright. Clinging to the tree trunk, she might have managed to keep her footing... had the tree itself not begun to shake as well. The loud snap of a branch overhead drew her attention upward and she let out a muffled shriek, stepping backward and tossing her hands over her head in order to protect herself.
Which, of course, is when the shaking finally caused her to lose her balance. Green eyes wide, she went down almost in slow motion. Her hip jerked painfully when it made contact with the ground, her ankle twisted at an odd angle and, while not broken, definitely wasn't going to hold her weight for a few days at least. Worst of all, though, her head managed to land directly against the edge of a rock that was protruding from the ground.
One sharp jab to the temple and, just as the world began to fade to black around her, she had the distinct feeling of her shoulder landing in the rock salt as her arm flopped easily past the barrier and landed directly at the demon's feet.