From my experiences, I was both the runner and the chaser — I was the one who first ran from the connection because I was overwhelmed, and once I realized that the connection that I have with him is special, I started to chase him back by apologizing for trying to block him out of my life.
I believe that once you start to learn about the Twin Flame experiences, you realize that there is no distinction between the runner and the chaser. You both experience the energetic turbulence in your connection that affects the running and chasing process.
I also believe that if you are one who is doing more energetic clearing, you are the one driving the energetic flow of the connection. If you are more centered in your energy, then you are most likely to be responsible for grounding your Twin Flame.
You are also responsible for ending the running and chasing cycle; Once you realize the dynamics and workings of the running and chasing, you can influence how your Twin Flame responds to your actions.
If you have been the chaser, you can choose to surrender, and if you are running from the connection, you can choose to face your journey and embrace your fears.
I believe that knowing about the workings of the Twin Flame experience is an added advantage to being on the Twin Flame journey.
I hope that my experience helps you with your question.