That's the problem as I see it. First it's a misdirected push (Oops, didn't know that was a ref, sorry), then it's a harder shove where the ref falls to the ground (Oops, still didn't know that was a ref...heat of battle and all that), then i's a swing that accidentally connects with a ref (Hey, I was swinging at that guy and sorry I hit a ref). Are we going to judge every physical interaction with a ref based on this incident? Watch for super arbitrary suspensions or fines in the future based on the degree of contact with a ref. The easier solution should be "ANY contact with a ref, intended, unintended, or accidental, in the midst of a personal foul/fight should result in a 4 game suspension." That way players won't put themselves in that situation.