Helping a friend through divorce

My very best friend is starting the process of "trying" to divorce his wife.  He is completely emotionally detached from anything and everything related to his wife.  However, they have two children.  He loves his children more than anything in this world.  He feels they are not in a better situation with the strain they see every day within their parents relationship, but also cannot bear to see them hurt.  This past weekend, he told his wife that he wanted to move out for good.  They have been having talks for many weeks and they had always left it as they would get back to each other about how their feelings were progressing.  Well, they had the conversation that he made up his mind, and she immediately grabbed the kids, brought them into the room and said, "If you are going to do this, do it now."  He couldn't bring himself to do it.  So now they have not spoken about it in a day and a half and he is completely conflicted.  I am worried about him.  As being someone without children, I don't know what to say.  My logical voice says you are not choosing whether or not to be a dad, you always will be.  You are actually choosing between two futures and you need to decide which one you want and formulate a plan.  But what can his wife be thinking right now?  They have not spoken.  He has not said he wants a reconciliation.  Could she already be filing?