This female Auplopus carbonarius  had caught a Wandering crab spider (Philodromus aureolus) (det: Simeon). I could observe her while she was turning and touching the spider, whose legs were already removed, and brushing herself.
Then she started to walk, pulling the spider with her mandibles attached to the spinner and the spider kept between her legs and underneath her, across the wall towards a support of one of the bee hotels and disappeared behind it. She pulled the spider inside but it was fat and didn’t fit immediately so only after pulling and navigating it to the widest part of the entrance did she manage to reel it in.
References1 Nederlands Soortenregister