you ever see a black widow vs. praying mantis fight?
whoooo-wee! my bf saw a praying mantis end up in a widow's web and he got to witness that. both bugs fought valiantly with both being injured in the process but the widow prevailed only because she "tied down" the mantis's front legs and then went around it to deliver her fatal bite.
i've seen a large spider release a bee from it's web after struggling to get a good bite on it without being stung but then give up to avoid injury to itself.