HELP In chapter 10 of the scarlet letter, What do you think Chillingworth saw, Why?

At the end of Chapter 10 when Dimmesdale fell asleep, Roger Chillingworth "thrust aside the vestment that, hitherto, had always covered it from the professional eye." What did he see? He saw the letter A which Dimmesdale had been cutting into his chest from the moment Hester was punished for their sin.

Explanation:

I think Chillingworth may have seen the letter "A" on Dimmesdale's chest.

Explanation:

Well since Hester has one on her chest I think that it makes sense. If it's true, it means that Dimmesdale has had some kind of "interactions" with Hester which would lead me to think that he might as well be the secret man Hester doesn't want to reveal.

Maybe my explanation was too exaggerated...but I tried.

adding more details about the struggle rainsford experiences as he swims to the shore