Coomon Cerulean being hunted by a jumping spider

Yesterday evening, when I was in my garden, watering the plants, I saw, about 5 small butterflies flying in circles around the jasmine vine. When I went to take a closer look, I saw a jumping spider munching on this sweet little creature. My first instinct was to try save the butterfly, but then I thought, the spider needs to live too. And also, the butterfly was almost dead. [ Probably the spider injected its venom, I am not sure about that].