Teddy Sanders:  We need to use the Taiyang Shen .
Vincent Kapoor: Uh huh
Annie Montrose: What am I missing ? Why is that important ?
Vincent Kapoor: Beause we can only do _ one _ .
Teddy Sanders: Send Watney enough food to last until Ares IV , or send Hermes back to get him right now .
Vincent Kapoor: Both plans require the use of the Taiyang Shen . So we have to choose .