The old notion of messing around with nature generating more problems than good. We briefly see glimpses of another dead and bloody person on a barbwire fence. A huge swarm of bats attacks a truck and Kimsey shoots a bat that gets inside as he and Casper try to prevent others from doing so. She uses the car's cigarette lighter on one and gets bit by another. Kimsey fires at the bats with his gun.
Several bats kill another bat that the scientists have tagged.
The bats kill a short order cook and then attack a restaurant patron. A swarm of bats attacks the townsfolk in the middle of town causing the deputy to run and crash through a glass door before being attacked and killed by the bats. A car crashes into an electrical pole, sending it down to the street, while other vehicles crash into each other, causing them to explode and burn. Another vehicle crashes into a ticket booth. Casper fires several shots a bat that's menacing her.