This is not what I signed up for.

Six men are about to rob a bank. They sit outside it in a car. One of the men tells two of the men that they're going to wait in the car while the four others go in and do the job. The two men don't like that. One of them says:

This is not what I signed up for!

To which the man in charge responds:

You and your friend signed up to do exactly as I tell you to.

1. Is the phrase natural to use in a context like this?

2. Is the response correct and natural as well?