I do not think this needs to be added at all other-wise people would kill for crowbar pushing, if someone kills for swinging a crowbar near someone they need help.
But the reason T baiting is KoSable is because people used to shoot near others and you could not tell if they were trying to kill you or not, hence why T baiting is only KoSable when shooting in someone's direction. If someone is crowbaring near you I do not see a threat.
Difference between t baiting with a Gun and a Crowbar is that a gun can kill you in a fraction of a second while a crowbar would take 2 or 3 seconds to kill someone. A crowbar isn't really a threat, while a gun is.