Competition: An uneasy alliance

You are either on a mission assigned to you by your superiors or taking up a personal mission of your choice. However, things do not go as planned and you meet your archenemy. You hate each other very much, but the circumstances force you to cooperate, in order to save your lives, as only working together gives you any chance to survive.

In minimum 500 hundred words long entry describe what happens in the situation described above. Submissions will be judged in accordance to the Voice Fiction Rubric.