Weird Garry's Mod Thing

so i was playing garrys mod at around 12:30 AM, and i was just playing around having two npcs fight, i deleted them bc i was bored of them, i decided to walk around for a bit and i randomly saw a npc called "The Killar Dimon". Now, i didnt spawn these in, as a matter of fact, i was spamming z to delete them if i could, they all had 1 hp but couldnt die to normal guns so i had to get an admin gun and kill them, they looked very weird too. my frames also dropped more the longer i stayed in the game. this could just be part of an npc i have, but i dont know If anyone is wondering, this map is called "Gm_York_Remaster_Night" and the addon for the admin gun is "[Improved] QTG Admin Gun", the HUD thing is part of the "Murder Drones [SWEPS]" addon THIS IS NOT A JOKE VIDEO I SWEAR I DID NOT SPAWN THESE THINGS IN IF THIS IS JUST PART OF A NPC PLEASE TELL ME IN THE COMMENTS