So, I've been having an issue with this. Some guy came into my mission, I wasn't willing to fight both the bot + his bot fleet and him in a Niagra, so I decided to split them apart by running away for a bit. Eventually when I was about to turn around to start engaging he left. After that while I was sailing home from my mission I saw him again, so I decided to engage him. Unfortunately he wasn't keen on fighting when the odds weren't hugely in his favor, so he ran while telling his bot fleet to attack my sails... I was still able to catch up, but because of the stupid battle timer being only a couple minutes, he got away. I tried again, and he got away again. It's stupid that there isn't a mechanic that makes it impossible to leave if you are within a certain range of your enemy. I think this basically kills the open world pvp in this game since it's nearly impossible to catch up to anyone within the couple minutes you are given to catch up. I guess I'll just grind missions until they do something about this. I like the idea of not being able to leave if you are within 750 meters of your enemy.