What everybody misses when bringing up the Cotchin incident is that Shiel continued to play out the rest of the qtr and only left soon after Astbury knocked him on the head. It is more likely that Astbury caused the concussion than Cotchin.
I don’t even care if Cotch did concuss Shiel. It was a football act, Trent got lower, went in sideways to protect himself (like the AFL wants) and won the ball, something we are all taught in juniors.