Akatsuki said they only have one left.

I AM NOT SURE IF THE FOLLOWING IS SPOILER MATERIAL, IT WAS PRESENTED IN THE PREVIEW FOR THE NEXT EP:

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In the preview, they said that akatsuki already captures 3 or 4 I think, not 8... Maybe one of them was a mistranslation?
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I was also pretty confused at the end of the episode for a short bit. For a while I thought it was akatsuki hanging off that rock, since the other member was bleeding. I thought that the 2 tails won. It really came as a surprise that she lost, since it seemed like she had an advantage in the beginning. They really do need to train these jinchuuriki better...