The coral snakes fangs are in the front of its mouth and fixed....not hinged like a pit viper. About 1/4" long and fixed makes some people think they have to chew on you or get the webbing between fingers. Myth....they can open their mouth quite wide and strike making a good puncture on naked skin. Clothing limits them more than other venomous Texas snakes.
Coral snakes are related to Cobras and in North America their venom is only second in toxicity to the Mojave rattlesnake.
Sorry for what happened to him but if you don't know what the snake is don't mess with it.
Their fangs are really irrelevant. Venom sacks are not attached the to the fangs, venom sacks are along the teeth and enters the victim through the cuts that the rows of teeth make. The longer they stay attached (as they chew) the more of a dose you get.