This is from Will Smith's memoir:
"When I was nine years old, I watched my father punch my mother in the side of the head so hard that she collapsed. I saw her spit blood. That moment in that bedroom, probably more than any other moment in my life, has defined who I am."
"Within everything that I have done since then — the awards and accolades, the spotlights and attention, the characters and the laughs — there has been a subtle string of apologies to my mother for my inaction that day. For failing her in the moment. For failing to stand up to my father. For being a coward." -Steve Kioko
Just in time when I have thought about it too. This is a post I stumbled in FB from that book. It might be that what caused his action was his trauma and this was his way of "trying to defend/help" someone he loves. Triggers can cause diff emotions or overreaction. Traumas can be addressed in diff ways yet he just chose this manner.