I'm not surprised. You're nothing if not consistent.
This is the problem when you try and compare incidents and outcomes but, in any event, I can't take seriously the idea Clark would have been as aware of impending contact as Shiel was. That's just not plausible. Clark has his eyes on the ball. Mackay is at least 20 metres away as the ball falls to the ground ... see the screen grab below. Then, as Mackay approaches, Clark clearly has no sense Mackay is about to leave the ground, hit him hard and break his jaw—logic says he would have braced for that contact or altered his course. He did neither.
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That is where this argument completely falls over. The risk of catastrophic injury was made all the more possible by Mackay choosing to barrel into the contest. So, what were better options? He could have waited for Clark to take clean possession and have tackled him. He could have contested the loose ball if Clark fumbled. He could have corralled Clark in an effort to intercept his disposal. He could have allowed Clark's opponent (Berry, I think it was) to have broken up the play with a tackle ... after all, he was right on his hammer. The point is, he had options that would have better reflected the duty of care a player has to minimise the chances of a terrible injury to an opponent. And, crucially, he had time to assess these options and change his actions.
You're undoing yourself here. Why, then, did Mackay opt to run directly at Clark if the fall of the ball was so unpredictable? Probably because his primary goal was not to possess the ball but to inflict maximum hurt.
Has that been confirmed? Source please. I doubt they even ran a concussion test, given the nature of the injuries.
Bear in mind our knowledge of concussion is improving rapidly, off a low base. In the past 10 years, we've learned a lot.
More and more parents will steer their kids away from footy unless the game is seen to be taking affirmative action on unnecessary and avoidable head-high hits.
So, to those who say the so-called sanitised game is not footy as they know and love it, would you prefer footy disappeared into irrelevance because the next generations are choosing soccer and basketball instead?
Footy's great without this kind of incident. In fact, it's better without it.