NPC problem

When I play singleplayer or multiplayer and spawn a fast zombie and an antlion, they attack me and don’t do damage. But I am 100% SURE that there is nothing stopping them from damage like god mode or something. Any help or ideas? :rock:
And I now believe its only melee attacks that dont damage me… Guns do hurt me.

Maybe there’s a script you downloaded from an online server. But I’m not sure if it’s possible to change the singleplayer game through multiplayer downloads.