Over a hundred zombies stared with pale white eyes at the human who had suddenly appeared at the rooftop entrance after all these years, falling briefly silent.
If they still possessed consciousness, they would surely have been tearfully grateful to this human. After all, they had been trapped here for far too long.
But in the very next instant, the zombies let out frenzied roars and lunged at the suddenly appeared youth!
Shen Feng snorted coldly and waved his hand, about to command the Grey Tide to devour the zombies completely.
Nothing happened!
He had gotten too used to using the Grey Tide and had momentarily forgotten that it was offline!
Cursing inwardly, Shen Feng immediately yanked the iron door over and slammed it shut. But he was a little too late—the foremost zombie had already thrust out an arm, blocking the door.
Shen Feng immediately raised his shotgun, aimed at the zombie's arm, and pulled the trigger.
"Pew..." With a soft sound, the close-range buckshot shattered the zombie's arm bones and muscle tissue, severing the entire arm.
"Clang!" The iron door finally shut. Shen Feng quickly slid the iron bar into place, locking all the lunging zombies inside.
"Bang, bang, bang, bang..."
The zombies kept battering the iron door. Fortunately, it was nearly two centimeters thick and completely braced by the iron bar. Even with their greatly enhanced strength after mutation, the zombies could not force it open.
Several sunken bullet craters marked the iron door, as though a fierce gunfight had once taken place here.
After all, this was Mexico City. The people who had installed this iron door had probably not originally meant for it to keep out zombies, but to protect against gang shootouts.
Only then did Shen Feng notice a mummified corpse curled up in