But he would almost certainly feel it his duty to expose him.

He would feel that that would end the complication with his sister once and for all---the easiest way.
He would feel it his duty---these people and their duty! Well, at least he would have his game of football first---no one could take his afternoon away from him.

Margaret would be there to watch him and he would play! Oh! he would play as he had never played in his life before! Bunning's voice came to him from a great distance--- "What are you going to do?
What are you going to say to Craven ?" "Say to him?
Why, I shall tell him, of course---tell him everything." Bunning leapt from his chair.

In his urgency he put his hands on Olva's arm: "No, no, no.

You mustn't do that.