What epiphany happens in a sound of thunder short story?

In Ray Bradbury's "A Sound of Thunder," the protagonist, Eckels, experiences a profound epiphany when he realizes the catastrophic consequences of his actions in the past. After stepping off the designated path and inadvertently killing a butterfly, he witnesses the drastic alterations to the present, including the rise of a totalitarian regime. This moment serves as a powerful reminder of the interconnectedness of all events and the fragility of time, highlighting how even the smallest actions can have monumental repercussions. Ultimately, Eckels grasps the weight of responsibility that comes with tampering with nature and time.