Agree; left foot is visible behind front girl's left elbow; right leg of girl behind is upright and bent at knee so it's angle coincides with body and right upper arm of front girl.
I agree, to me it looks more like someone has their legs open, but on bigger picture of things - quite a small matter - there is someone behind her (so what!?)
I take more issue with this picture, which detracted me from adding her to my HL (as her face is slightly manly and vastle different from the other pics):
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