How dare that bubble try to be unbreakable. What's making it unbreakable? Her friend's helpful powers to cover sorcery's deficiencies fill her in: it's because it's "part of" that fellow there who attacked them with those black holes. Well. He doesn't usually have a bubble, does he? He must be thinking of it in some special way to make it count, mustn't he?

He can't keep that up every microsecond. And her friend has made her so gloriously fast and given her such exquisite timing.

The bubble evaporates.