I have been on servers where the admin spawns a npc(which i know how to do) then he sits there for 2 minutes putting in commands and then all of a sudden the gunship/strider/zombie/ or anything else attacks people. I spawn NPC's with some friends in a server and i tried several commands and i can't get any of them to move around. This guy even got DOG to run around the map and put some gunship flying around. It was fun. It was almost like coop.