Whom does Hank find Jacob talking with when he returns to the car in Chapter Three?

Hank sees Jacob standing outside the car, talking to someone on a snowmobile and gesturing wildly. Hank gets closer and sees that it's Dwight Penderson, an older man who lives in the area. As Hank approaches, trying to seem calm and in control, he sees Jacob suddenly swing out wildly at Mr. Penderson, striking him in the side of the head.