Person 1 in a park chatting to a friend. Has a dog on a standard length lead.
Person 2 walks past with a 3 year old.
Dog jumps up and scratches child as person 1 talks to friend.
Person 2 gives evils and comforts sobbing child but says nothing to dog owner.
Person 1 thinks they did nothing wrong as dog was on lead and child walked too close.
Who was BU?