Gila monsters don’t even have fangs. They have grooved teeth down which their venom flows. And it’s not that fast acting like snake venom. This guy must have been allergic to it. Years ago, a herper friend offered me a chance to pet his gila monster. He assured me it was very tame. I still turned down the chance, heh heh.
I hsve heatd similar about the Komodo Dragon lizards.
Their saliva is quite toxic to humans. All it takes is prolonged contact, or a bite that breaks the skin.
But then, Komodos are larger and far more combative than this lizard.