@pakman
Holy fucking shit, I thought the journalist misrepresented the finding, so I checked the WR website.
In short, they accept that there was bite-like injury to Mostert, the only possible source of the injury was Sinckler, but intention was not proven to their satisfaction.
Now I don't mean to suggest that the SC who chaired the hearing is a blithering incompetent, rather that he would have failed law of evidence at any competent university.
The standard (quoted in the decision) is that the cited player must show on the balance of probabilities that the citation must not be upheld.
So the bite-like injury was either intentional or not. I would suggest that a bite is more likely to be intentional than not, but even if the panel doesn't agree, there needs to be evidence, any evidence, to support the conclusion that it was not intentional. The standard they used here was the "beyond a reasonable doubt", which basically requires all reasonable alternatives explanations to be dismissed.
I don't know if Sinckler bit Mostert and I understand the panel not wanting to find a player guilty with limited evidence, but the mental gymnastics that they had to go through to justify their finding is absurd. The regulations, as written, are maybe wrong and if WR wants to maintain some credibility they should rewrite them ASAP.