I've just come back to this thread.
Op - in your op you said he is a loving man and this was the first time anything like this had happened.
Except then you went on to say that he is controlling, emotionally abusive and that he pushes the kids around.. so although unexpected, this wasn't a jekil and hyde (sp?) type situation was it? this was a question of a man who is emotionally abusive already pushing that boundary to its very limit and then stepping over it into physically abusive.
You said:
"he is a good
man. He is so caring usually towards me and the children. He often cooks, builds huge lego things with the boys etc." And when the boys grow up, what do you think they will think is the norm? To cook the dinner - yes let's hope so. To interact with and play with their children - absolutely let's hope so. To knock their partner unconscious - oh yes, they'll think that's normal too. He is their role model - what kind of example is he setting them?
And your four year old daughter who thought that her mummy was dead? What happens next time? Next time she might think her mummy is dead, and the time after that, and maybe even the time after that. But there will come a time when she won't think that, because the norm is for her mummy to be knocked unconscious and to then wake up again and carry on as if nothing has happened. So one of the "next" times that this happens she may not be so affected by it. not think that her mummy is dead after all, and not pay much attention. And then one day the norm won't happen, she'll be expecting her mummy to wake up and carry on, but she won't - her mummy will be dead.
I actually think that there are some instances where someone can snap and lash out and it be a one off incident. A slap perhaps, grabbing someone too firmly and frightening them, that sort of incident. If my dh slapped me I wouldn't stand for it and it would be over, but I can see that it could happen in a heated discussion where one partner loses control and lashes out like that, regrets it bitterly and it never happen again.
But not in this instance. Not where, as a first time lashing out he knocks his partner unconscious and then shows no remorse at the time until he is thrown out of the marital home.
You say you love him. why? How can you love a man who is abusing your children? Because to abuse their mother in front of them is abuse.
It doesn't matter how loving he was before this. He doesn't love you, and he doesn't love his children. Any man who did wouldn't do this to them.