This is a pretty specific situation.
We are two interns working on a project for a few months and we are about to finish our internship. A senior developer has been designated to continue the project after we leave, and we are supposed to code with him as a team of three so that we can do a little bit more work while helping him start on the project.
The problem is that instead of coding, as our manager told him to before going in holidays, he keeps just telling us to code things saying "he's too busy to code", most of which are easy things to code that would be perfect for him to familiarize with the code.
Plus there is a big part of the project we are not supposed to do that the manager is saving so that the senior developer learns how to handle the project through this big part. But it seems the senior developer is trying to make us do the big part so he really has pretty much nothing to code when we will go (expect we do have work to finish and certainly not this big part).
He has been already corrected by our manager in the past for trying to make us do his job a couple times during the internship, but this time with no manager around there is nobody to prevent him from doing that.
Our manager told him that starting to code on this project was his only work for the rest of our internship.
How can we make him code without burning bridges?
UPDATE: He now says he will start coding but want us to help him, so I guess that's a start.