I think I can even see a pedipalp in there... looks like maybe a Steatoda sp (aka "house spider")? Cellar spiders are known to be quite adept at eating other spiders, but I've mostly seen them eating crane flies. Nice catch, for both of you!But looking again closely at that second image,
they look more like spider's legs being tangled up and devoured.
Are they cannibalisitic?