Falling backward on the floor seems like an insufficient story.
Brings to mind the joke about the thug on trial for stabbing a guy to death. “ Your honor, I was just sitting there eating a steak with my knife and this guy comes running around the corner and runs right into it.....twelve times.”
I fell backwards on ice last weekend, feet went out, became airborne, first thing to hit the very hard ice was the back of my head (I don’t remember any of this).
Bled in my head in three places, not enough to die - but it sure has cramped my style.