That said the ref was completely useless. He did not want to give a yellow early, it seemed, to the point where it became clear to the players that they could get away with whatever they wanted. Until he decided to book Dunk despite several earlier similar fouls. A most strange performance...
Their keeper was doing kick ups facing away from the pitch when he should have been taking a goal kick, a reasonable yellow in my opinion. Though he would not have got booked if he had wasted that amount of time in a more subtle way. As for Dunk it was too for away for me to see.