Each relationship is different but mostly they start with verbal abuse, a little insult here another one here; but then things get more intense the abuse can get to another level and turn into physical abuse. That doesn't mean that all abuse starts the same some might start with physical abuse.
Not in all cases. A majority of the time yes. Domestic abuse is perpetuated by a narricist a majority of the time.
True, most sports have teams and you have to bond with your team mates to get ready/win the game.