The twins.

Since it all happened too fast, the father of the twins barely had a moment to think. He did what any father would do when love outweighs fear; he threw himself between the zombie drone and his daughter, shielding her with his own body.

In that split second, while clutching his other daughter tightly in his arms, he braced himself. The drone's bite tore into his shoulder with a force that was anything but human. Flesh ripped, bones snapped, and and a fountain of blood erupted, staining the rain-soaked ground beneath them.

The virus had turned the drone into something more than undead, something with a brutal, mechanical strength that left his shoulder mangled and his muscles and sinew shredded.