...I mean really, what other conclusion can you draw? The other two girls don't have a mark on them, which is utterly impossible in Queen's Blade. Clawdette doesn't look defeated, but rather irritated. Mirim has a look of amazement, while Miria has a look of sympathy.
She tripped, she fell, and her outfit sponateously exploded on the way down. It'd be a parody if it wasn't source material.
Btw, is this made by Eiwa? Sure looks like it to me.