One says that he will need help to destroy the Engineer ship but both pilots if even one was really required would not be. With almost no deliberation they both decide that death was preferable to joining Vickers.
Was this a bit of dark comedy, showing just what a miserable person Vickers was or was it more reflective of how low her chances of survival were and the two pilots just wanted a quick death rather than one eventually fighting over the limited resources (2 years for one person so less than a year for the three not to mention Shaw) of the escape pod? Based on the distances involved, rescue was impossible even if the company decided to send another ship -- I forget if the time in sleep chambers was mentioned but presumably the trip took many years if such chambers were needed.