Enabling decals with script

[Kyle]

Go to "Entities", then "decals", and then use one of those decals which can be used to be set active or inactive. They only show up when they're located on a surface, so they can't hover in the middle of the editor.

You'll also have to keep the decals a tiny bit off the ground so they aren't ontop of each other, which causes the texture of the blood decal to flash. I don't think you'll be able to use any of the other decals to be set active or not though. :/