Who was the stranger who met Captain Hagberd? What was the Captain’s reaction to the meeting?

The stranger was the son of Captian Hagberd, Harry Hagberd. Captain felt nervous on meet first who was stranger for him as that stranger is talking about his son and then he suddenly got out of control when stranger said ‘The devil he is!’ The stranger marvelled greatly, Captain started shouting, his feet squelched in the puddles left by his industry. He stumbled in the holes of the ruined grass plot. He ran blindly against the fence.