If World Rugby wasn't such a joke they'd ban Ngwenye for dangerous play. This isn't just an unfortunate, unavoidable accident - it's him being completely incapable of doing the basics. And if that means he's a danger for others, he shouldn't be allowed play until he learns not to be a danger.
Does anyone know what 'liable to sanction' means for feigning injury? If it means they're liable to be penalised then it's not much of a deterrent. I would have preferred to see 'liable to a yellow or red card and suspension'.