Absolutely nothing I can see wrong in the play leading up to the incident, culmination of factors led to Joe being knocked out and clearly lost consciousness.
Having a fit having suffered a head injury is not especially uncommon at amateur level one of my mates has played in 5 or 6 games it has happened in - that is just a poll of 1 person. Though very distressing and as a father and husband - I wish nothing but the best and a speedy and 100% recovery for a bright young star.
I think some people are looking at the outcome of the incident and trying to make a crime fit the result - but sometimes in a professional collision sport things like this just happen. There isn't always a villain, the best thing we can do is wish Joe and the Westy family all the best and a speedy and complete recovery, I am sure in the weeks to come if he remembers it he will clear up there was no malice or intent in the collision and he will have had worse and got up from them, it's just this one was a seriously bad outcome.