I guess you guys have been living under a rock.
But yeah rule clarifications have been dead for a while. Its fine if you guard a body to prevent recovery like guarding anything marines want to prevent them from getting it.
But if you’re going to start a timer so you can time their perma and then leave, AKA actual metagaming, you’ll probably be slapped with metagaming.
But yeah its fine to defend your kill, its been fine to do this for months.