When you have your mind set on a target, there is nothing anyone can do to stop you reaching them. If an opponent Disengages from you, you can attempt a Challenging (+0 SL) Athletics, Drive, or Ride Test after their Turn ends. A success provides an extra Move to chase after them and lets you freely Disengage from all other opponents to do so. Further, any Tests to chase as a Pursuer in a Pursuit benefit from +1 SL.

Core Book, Page 124