Man, i thought this ref was just going to let them play. He knows that hand ball was unintentional, just let them play.
You don't unintentionally wave your hands in the air in the general direction of the ball when you clearly know you lost a header.
Unintentional would be the ball hitting the arms of a defender when they are close to his body.
I can't believe how some of you still don't see how that's a clear penalty.