I've posted this before, the rules state:
See page 61 of the Rules of Australian Football 2020 as published by the AFL.
The point being, if one player strikes another, and it does not have to be intentional, they are reported, You could also put this under unreasonable or unnecessary contact to the face of another person. Then the tribunal sorts out whether it was careless, deliberate or accidental and if any penalty is to apply. But, there is no doubt according to the rules above that Dangerfield should either have been reported by the umpire or referred by the MRO.
Are you seriously telling us that Dangerfield did not strike, or, make unreasonable or unnecessary contact with Vlastuin's face? Seriously?
DS