What did the second visitor do ?

Jim observes a blind man wearing a tattered old cloak, tapping a stick, approaching the inn. Innocently, the man asks where he is but when Jim tells him and leads him to the entrance to the inn, the man cruelly grabs a hold of Jim's arm and threatens to break his arm if he does not take him directly to Billy Bones, introducing him as "Here's a friend for you, Bill." When he sees the blind man, Bill Bones seems visibly upset. Directed by the blind man, Jim brings Billy's left-hand to the blind man's right-hand, and something is passed between the two men. Soon after, the blind man leaves and Bill proclaims "Ten o'clock! Six hours. We'll do them yet." He springs up from his seat, but before he can do anything, he falls over dead.