Who helps the doctor remove the bullet from Tom’s leg? CH 39-end

Jim helped the doctor cut the bullet out of Tom's leg.

When I got to where I found the boy I see I couldn't cut the bullet out without some help, and he warn't in no condition for me to leave to go and get help; and he got a little worse and a little worse, and after a long time he went out of his head, and wouldn't let me come a-nigh him any more, and said if I chalked his raft he'd kill me, and no end of wild foolishness like that, and I see I couldn't do anything at all with him; so I says, I got to have help somehow; and the minute I says it out crawls this nigger from somewheres and says he'll help, and he done it, too, and done it very well.