What makes Manolin cry?

The sight of the Old Man's hands makes Manolin cry.

He was asleep when the boy looked in the door in the morning. It was blowing so hard that the drifting-boats would not be going out and the boy had slept late and then come to the old man’s shack as he had come each morning. The boy saw that the old man was breathing and then he saw the old man’s hands and he started to cry. He went out very quietly to go to bring some coffee and all the way down the road he was crying.