In this case the Inidgo is immune to the Rattler's bite. It had no chance against a hungry Indigo Snake that over powers it's victims instead of constricting them. Sucks to get eaten alive!
In this case the Inidgo is immune to the Rattler's bite.
You know what's even more fascinating? Rattlers are not immune to their own venom! That's why if 2 rattlers get in a fight, they don't bite each other. Other snakes like King and Milk snakes are also immune to Rattler venom.