I'll say that you have not yet pushed the pirate into flank speed. Raiders are freaking fast.<br/><br/>Also, a stern chase can't be initiated yet, since you're too close to each other.<br/><br/>Though before I advance the turn...what are you trying to do? You explicitly can't fly backwards using retro rockets, all you can do is cut your speed sufficiently that he overshoots you (your current speed being 13, Retros will cut your speed to 7.)