Another thing Sandor does almost first thing - wish out loud that Bran, a young boy with idealistic aspirations of becoming a knight of the kingsguard, who just experienced violent, life-altering, traumatic child abuse at the hands of one of the very knights of the kingsguard, would hurry up and die already.
"The boy is a long time dying. I wish he would be quicker about it."
This, of course, has nothing at all to do with the image of child Sandor at death’s door from horrific facial burns at the hands of a man who would later be knighted by a prince.
There’s a lot there. It’s like he’s saying without realizing, "I wish that idealistic children wouldn’t exist so that I wouldn’t have to be confronted with them or watch them be in pain. It is better for a child to die rather than survive and live with the kind of traumatic abuse I have."