In The Scarlet Letter Describe the man who is standing on the outskirts of the crowd?

While standing on the scaffold Hester recognizes a deformed man standing on the outskirts of the crowd and becomes terrified, holding Pearl closer to her chest. The story says that when he recognized Hester standing alone on the scaffold "a writhing Horror twisted itself across his features, like a snake gliding swiftly over them . . ." but that he gestures to her to keep quiet about his identity. It is later revealed that his man, who goes by Roger Chillingworth, is actually Hester's husband Roger Prynne and he is so eaten up with the taste for revenge that his deformity is a representation of the evil inside him. He wants to see the man who impregnated his wife be punished at her side.