Ch. 10

In chapter 10 Henry and the tattered man are saying how brave and strong Jim was to have mustared all that strenght even when he shouldn't be able to even walk. Henry leaves the tattered man behind later. But he wakes up when the tattered man is trying to walk around. The tattered man tells Henry how he got wounded and he says that he can't die because he has a family. He also say that Henry is looking a little pale and should have his wound looked at. When the tattered man says that Henry runs away and leaves the tattared man. Leaving him to die alone. The tattared man yells after Henry but Henry fells that no one can know his "crime."
My question is: If Henry knew that the tattared man was going to die then why didn't he just stay with him, and tell him his secret? He was going to anyway.