Read it through once

“Because he said he wasn’t. He was taken by surprise, you see, and it is not likely that he could tell the truth without preparation. Not that he would have prepared, if he had had the chance, for I do not think he would. I am not charging him with that. In the same space of time that he could prepare to speak the truth, he could also prepare to lie; besides, his judgment would be cool then, and would warn him against fooling with new methods in an emergency. No, I am sure he was glad, because he said he wasn’t.”