Can a coach point be spent to reroll a rerolled die? I assume so since you can coach point an opponent's die.
Under the Pushed result: This ends the model's activation immediately. This could be read that if you push an enemy model your turn ends but if you get another result (Knocked Out or Stunned) you can take remaining actions? I think it is in reference to an acting model being pushed and losing the ball, but wanted to clarify.
Hmmm... usually I would limit the amount of re-rolls, simply to avoid the games from getting stale, but it does make sense that both players should have a say in it. Maybe you can play it so that if one coach once to re-roll a die, and the other one as well, then they both spend their coach point and they cancel each other out.
It's assumed that if the model is stunned or knocked out their activation ends, so we added that line just to clarify that pushed results also end the activation.
I can see that if a model is KOed its activation would end, but I don't see where it says a stunned model's activation ends. I always assumed if they had activations left they could scramble back to their feet.