This episode is rather moving. The group from the hospital join together to take shifts to look after Dr. Cox, after he is suspended from work for showing up drunk. J.D. makes a poor excuse to get out of his shift to look after Doctor Cox by saying he doesn't agree with what he did. Though in the end, J.D. goes to look after Cox and explains why he didn't come initially and that he is proud of Dr. Cox for still caring so much for his patients after all these years.
At the end when they are all at the bar celebrating Cox's return he thanks J.D. for bringing him back. I love the relationship between Cox and J.D. Cox is more than J.D's mentor though he won't admit it any time soon.