Black Dog visits the Captain

From the text, we can infer that the two men are not friends.

Then all of a sudden there was a tremendous explosion of oaths and other noises—the chair and table went over in a lump, a clash of steel followed, and then a cry of pain, and the next instant I saw Black Dog in full flight, and the captain hotly pursuing, both with drawn cutlasses, and the former streaming blood from the left shoulder. Just at the door the captain aimed at the fugitive one last tremendous cut, which would certainly have split him to the chine had it not been intercepted by our big signboard of Admiral Benbow. You may see the notch on the lower side of the frame to this day.

That blow was the last of the battle. Once out upon the road, Black Dog, in spite of his wound, showed a wonderful clean pair of heels and disappeared over the edge of the hill in half a minute. The captain, for his part, stood staring at the signboard like a bewildered man. Then he passed his hand over his eyes several times and at last turned back into the house.