It's probably the sparkly dust that did it. Spike feels marginally bad for sending her flying once he notices the way she had to recompose herself, and worse when he reflects in her situation. This better not be contagious.

"You want me to take you to see Brock, right?" Wild guess. He's not looking forward to being the one to break it to him, but it's not like he isn't up to his neck in debt for that guy. Trying not to sigh too hard, in case that knocked her over again, he nods."Alright, but I'll do the talking."