These are not flood games these are slayer gametypes where the players were given flood skins. Also yes it is modded in a sense.
lolIf you don't want to mod your game. You could go over to waypoint and yell at poeple then go on like the early days of infection where it was a trust factor. If you died you changed teams. Hopefully we will be able to change the settings for that because flood in campaign have always had wepons