The Sword of the Northwest

You tackle it, but you feel winded as you hit solid muscle, the butterfly is gradually growing, forming strong, quite noticable muscles, the antennae become sharper, the wings are now huge in size, nearly doubling your body size. The butterflies eyes are beginning to change colour, red, the creature glares at you, as you sit on your buttox, staring, watching intently on the creature that is now transforming in physical appearance, and you know its mental appearance has probably grown into an aggressive state, now is a good time to run, you watch the butterflies fangs grow. Do you run now? Or perhaps befriend the lepidopteran?