Prust lunges high, even if it wasn't a direct hit to the head, the follow through hits the jaw...this is very similar to the haglin hit against Alfreson in that the initial contact was not the head but the follow through was...and unlike Haglin, this was mid ice. Haglin's hit would have been clean if it was in open ice, the fact that Alreson was against the boards did not help Haglin. Not to mention that the puck was still in the area of Alredson vs 2 seconds after the fact Stepan gives the puck up. It was a bullshit head hunting hit. No doubt about it.
"Dirty late hit" from the Canadian broadcast network
IMO Prust should be gone for the rest of the series...at a minimum he should get 3 games.