A sound of thunder and Nethergrave were science fiction stories

A sound of thunder and Nethergrave were science fiction stories. The stories used technology to effect the main characters life. A sound of thunder used a time machine to go back into time 60 million years ago in a jungle. In nethergrave a guy by the name of Jeremy chose a virtual world instead of the real world. The climax of nethergrave was when Jeremys online friend had left him then he got a message from someone telling him to turn on his mic, but then Jeremy decided to leave the real world where he was ignored and bullied to go to the virtual world where he would never be bullied or ignored ever again. The climax of a sound of thunder was when they went to the past and that could affect the future once they go back to the present. I think both stories themes